Jamie Siminoff
James "Jamie" Siminoff (born October 18, 1976) is an American entrepreneur, inventor, and investor who is best known as the founder of Ring, the video doorbell and home security company that was acquired by Amazon in 2018 for approximately $1.2 billion. Siminoff's entrepreneurial journey became a cultural phenomenon when he appeared on the ABC television series Shark Tank in 2013 seeking investment for his company, then called Doorbot, only to be rejected by all five main "sharks"—a rejection that would later become known as "the biggest miss" in the show's history when Ring was sold to Amazon just five years later for more than one hundred times the valuation Siminoff had proposed on television.
A serial entrepreneur who has founded multiple technology companies throughout his career, including PhoneTag (the world's first voicemail-to-text transcription service) and Unsubscribe.com, Siminoff exemplifies the inventor-entrepreneur archetype, having conceived the idea for what became Ring while working alone in his garage in 2011 when he realized he couldn't hear his doorbell from his workspace. His journey from Shark Tank rejection to billionaire-dollar exit has become one of the most celebrated entrepreneurship stories of the 2010s, inspiring countless founders to persist in the face of rejection and skepticism.
In a remarkable full-circle moment, Siminoff returned to Shark Tank in 2018 as a guest "shark" investor for the show's tenth season premiere, becoming the first person in the show's history to transition from rejected contestant to investor. He subsequently appeared on multiple episodes, investing in companies that resonated with his entrepreneurial philosophy. Following his exit from Ring in 2023 after serving as CEO throughout the Amazon integration period, Siminoff became CEO of Latch (later rebranded as DOOR), a smart access company serving residential buildings, before transitioning to an advisory role in 2025.
Siminoff is the author of Ding Dong: How Ring Went From Shark Tank Reject to Everyone's Front Door (2025), a memoir recounting the unlikely story of building Ring from a garage invention to a billion-dollar acquisition, co-written with Andrew Postman. The book features endorsements from Jeff Bezos, who praised Siminoff's "missionary spirit" and "founder mentality," and from Kevin O'Leary, who acknowledged that passing on Doorbot was likely the biggest mistake in Shark Tank history.
Early life and education
Childhood in New Jersey
James Siminoff was born on October 18, 1976, in Chester, New Jersey, a small borough in Morris County located in the rural, hilly terrain of northwestern New Jersey. Chester is known for its historic downtown, antique shops, and proximity to various horse farms and outdoor recreational areas. The community, with a population of just a few thousand residents, provided a quintessentially small-town American upbringing that shaped Siminoff's work ethic and entrepreneurial instincts.
Growing up in Chester, Siminoff demonstrated an early entrepreneurial spirit and willingness to take on odd jobs to earn money. According to various accounts, his childhood and teenage years were marked by a remarkable diversity of work experiences that ranged from painting houses and bellhopping at a local hotel to shoveling horse stalls from neighbors' barns on his way to school. These early jobs instilled a work ethic and practical problem-solving mentality that would serve him well throughout his entrepreneurial career. The experience of manual labor—getting dirty, working hard, and earning money through effort—provided a grounding that many successful entrepreneurs credit for their resilience in the face of business challenges.
Siminoff's father reportedly founded a pipe manufacturing company, potentially providing an early model for entrepreneurship within the family. Growing up with a self-employed father likely normalized the idea of building and running businesses rather than working for others, planting seeds for Jamie's own entrepreneurial aspirations.
From an early age, Siminoff displayed a fascination with technology, gadgets, and the process of invention. He often spent time tinkering and building things, exploring how devices worked and imagining how they might be improved. This inventive spirit, combined with his willingness to work hard, created a foundation for a career that would span multiple technology ventures across different industries.
High school and early interests
Siminoff attended West Morris Mendham High School, a public high school located in Mendham, New Jersey, that serves students from several surrounding communities. The school has a reputation for strong academics and a supportive environment for students with diverse interests.
During his high school years, Siminoff continued to develop his interests in technology and business, though specific details about his high school activities and achievements are not widely documented. What is clear is that by the time he graduated, he had developed a clear sense that entrepreneurship—building his own ventures rather than working for established companies—was the path he wanted to pursue.
Babson College: A crucible for entrepreneurship
After graduating from high school, Siminoff enrolled at Babson College, a private business school located in Wellesley, Massachusetts, that is consistently ranked as one of the top schools for entrepreneurship education in the United States. Babson's curriculum is designed specifically to prepare students for launching and growing new ventures, with a practical, hands-on approach that distinguishes it from more theoretical business programs.
At Babson, Siminoff pursued a Bachelor of Science degree in Entrepreneurship, a program that combined traditional business education with specific focus on new venture creation, opportunity recognition, and the practical skills needed to bring ideas to market. The Babson approach emphasizes learning by doing, and students are encouraged to start businesses while still in school.
True to this philosophy, Siminoff founded his first business while still an undergraduate. He created Gadget Tronics, a company that sold televisions and stereos, gaining firsthand experience with retail operations, customer service, and the challenges of running a business while simultaneously managing academic responsibilities. This early venture provided practical lessons that no classroom could fully replicate—lessons about inventory management, cash flow, customer acquisition, and the daily grind of entrepreneurship.
Siminoff graduated from Babson College in 1999, equipped with both formal education in entrepreneurship and practical experience building and operating a business. The timing of his graduation—at the height of the dot-com bubble—meant he entered the professional world during a period of exceptional optimism about technology entrepreneurship, though the subsequent crash would provide sobering lessons about the risks and volatility inherent in startup ventures.
In 2021, Siminoff was invited to deliver the commencement address at Babson College, returning to his alma mater as a celebrated alumnus whose journey from student entrepreneur to billion-dollar exit exemplified everything the school aimed to produce. Following his speech, Babson awarded Siminoff an Honorary Doctor of Laws degree, recognizing his contributions to entrepreneurship and his embodiment of the school's mission.
Early career
First ventures after college
Following his 1999 graduation from Babson College, Siminoff wasted no time launching into the entrepreneurial career he had been preparing for throughout his education. His first post-college venture was Your First Step International, Inc., a company that aimed to help other entrepreneurs bring their ideas from concept to fruition. The company provided consulting and support services for early-stage entrepreneurs, drawing on Siminoff's own experience starting Gadget Tronics and his formal education in entrepreneurship.
In 2000, Your First Step International pivoted to focus on building and operating global wholesale Voice over IP (VoIP) networks in developing countries, recognizing the opportunity presented by emerging telecommunications technologies and underserved international markets. This pivot demonstrated the flexibility and opportunism that would characterize Siminoff's entrepreneurial approach—when one direction wasn't working, he was willing to adapt and pursue more promising opportunities.
The Bulgaria venture
Around 2001, Siminoff co-founded a Skype-like calling service in Bulgaria with a technically skilled partner. The venture represented an ambitious international expansion, attempting to build telecommunications infrastructure in a post-communist Eastern European country that was still developing its market economy and technology sector.
However, the partnership proved challenging. When his technical co-founder departed the venture, Siminoff found himself in a difficult position—he had business acumen but lacked the technical expertise needed to run a telecommunications company. Rather than abandoning the venture, Siminoff took a characteristically determined approach: he spent time at Barnes & Noble bookstores, reading technical manuals and teaching himself what he needed to know to keep the business operating.
The Bulgaria venture ultimately resulted in a merger, after which Siminoff sold his stake for approximately $1 million. While not a transformative exit, the million-dollar sale provided capital for future ventures and validated that Siminoff could build and successfully exit technology businesses. He would later describe such outcomes as "singles" rather than home runs—profitable ventures that taught valuable lessons but didn't achieve the scale and impact he ultimately sought.
PhoneTag: The first voicemail-to-text service
In 2005, Siminoff identified an opportunity that would become his most significant pre-Ring venture. Frustrated by the archaic and time-consuming nature of voicemail—which required dialing into a system, listening to messages sequentially, and trying to remember key information—he conceived of a service that would transcribe voicemail messages into text and deliver them to users' phones or email accounts.
This was several years before Siri or other voice assistants made voice-to-text technology commonplace. In 2005, the idea of automatically converting spoken messages to written text seemed almost magical, and no major service existed to provide this functionality for voicemail.
Siminoff founded PhoneTag, which became the world's first voicemail-to-text transcription service. The company used a combination of automated speech recognition and human transcribers to convert voicemail messages into text, delivering the results via email or SMS so users could quickly scan their messages without the hassle of dialing into voicemail systems.
PhoneTag operated on a subscription model, charging customers approximately $19 per month for the service. This pricing—relatively modest for business users who valued their time—allowed the company to build a sustainable business without requiring venture capital support. Siminoff bootstrapped PhoneTag, maintaining control and ownership while growing the company organically.
Selling PhoneTag
In September 2009, Siminoff sold PhoneTag to Ditech Networks for approximately $17 million. The exit provided significant capital and validated his ability to build and sell technology companies. More importantly, the PhoneTag experience taught him valuable lessons about product development, customer acquisition, and the challenges of scaling a technology business that he would apply to subsequent ventures.
The sale of PhoneTag also reinforced Siminoff's pattern of serial entrepreneurship—rather than retiring on his winnings or seeking employment with an established company, he immediately began looking for his next opportunity. For Siminoff, building companies was not merely a means to an end but a calling and passion that he would pursue throughout his career.
Unsubscribe.com
In 2010, Siminoff tackled another pain point in digital communication: the deluge of unwanted commercial email that filled most users' inboxes. He founded Unsubscribe.com, a service designed to help users efficiently clean commercial email from their inboxes by automating the process of opting out of marketing communications.
The timing was prescient—email overload had become a major productivity concern, and users were increasingly frustrated with the difficulty of managing their digital communications. Unsubscribe.com provided a convenient solution by handling the tedious process of unsubscribing from unwanted emails on behalf of users.
In 2011, Unsubscribe.com was acquired by TrustedID, a personal security company. While the specific terms of the acquisition were not publicly disclosed, the sale represented another successful exit for Siminoff and further demonstrated his ability to identify problems, build solutions, and find buyers for his ventures.
Ring
The garage invention
After selling Unsubscribe.com, Siminoff found himself at a crossroads. He had achieved multiple exits and accumulated capital, but he was restless for a new challenge—something bigger than the "singles" he had hit with PhoneTag and Unsubscribe.com. He decided to return to his roots as an inventor.
"I decided I was going in the garage and just invent stuff," Siminoff later explained. "I had all these ideas, and I'm just going to work on them."
The garage of his Los Angeles home became his workshop and laboratory, where he spent his days tinkering, prototyping, and exploring ideas. It was in this setting that the inspiration for Ring emerged from a mundane domestic frustration.
Working in his garage, Siminoff couldn't hear his home's doorbell when visitors arrived. He would miss deliveries, fail to greet guests, and experience the repeated frustration of discovering missed opportunities after the fact. For most people, this would simply be an annoyance to live with. For Siminoff, it was a problem to solve.
"When I was in the garage, I couldn't hear the doorbell," he recalled. "I looked online for a WiFi doorbell. It just made sense that one would exist. It didn't, so I built one."
In 2011, Siminoff created the world's first WiFi video doorbell—a device that would send video and alerts directly to a smartphone whenever someone pressed the doorbell or triggered the motion sensor. The invention addressed his personal pain point while tapping into broader trends around mobile connectivity, home automation, and security.
The reaction from the person who mattered most—his wife, Erin—was encouraging. She told him the device was a game-changer and that it genuinely made her feel safer. Having validation from someone outside his entrepreneurial bubble gave Siminoff confidence that he had created something with genuine consumer appeal.
Doorbot and crowdfunding
Siminoff initially named his invention Doorbot—a combination of "door" and "robot" that conveyed the device's purpose and technological nature. In November 2013, he formally founded the company and launched a crowdfunding campaign on Christie Street (a crowdfunding platform similar to Kickstarter).
The crowdfunding campaign exceeded expectations, raising $364,000—significantly more than the $250,000 goal. The success demonstrated consumer interest in the product and provided capital to develop and manufacture the initial production run. More importantly, crowdfunding created a community of early supporters who were invested in the company's success and provided valuable feedback as the product developed.
Shark Tank: The famous rejection
In 2013, Siminoff appeared on Season 5 of Shark Tank, the popular ABC television program where entrepreneurs pitch their businesses to a panel of wealthy investors (the "sharks") in hopes of securing funding and partnerships. The show had become a cultural phenomenon, launching numerous successful products and providing unprecedented visibility for the entrepreneurs who appeared.
Siminoff presented Doorbot to the sharks, demonstrating the video doorbell and explaining his vision for home security and connected devices. He sought a $700,000 investment in exchange for a 10% stake in the company, implying a $7 million valuation.
The pitch did not go as hoped. Most of the sharks passed on the opportunity, citing concerns about competition, valuation, or simply lack of interest in the product category. Kevin O'Leary, known as "Mr. Wonderful," made an offer—but it was structured as a loan with royalties rather than a straightforward equity investment, terms that Siminoff found unacceptable.
Siminoff declined O'Leary's offer and left the tank without a deal. For most viewers, this would have seemed like the end of the story—another entrepreneur who came seeking millions and left empty-handed.
Turning rejection into rocket fuel
Instead of discouraging Siminoff, the Shark Tank rejection energized him. The appearance itself, though ending in rejection, provided invaluable national exposure for Doorbot. Millions of viewers saw the product demonstration, and many were intrigued by the concept even if the sharks weren't.
Siminoff estimated that the Shark Tank appearance led to approximately $5 million in additional sales—a remarkable return on the investment of time and energy required to prepare for and appear on the show. The visibility also attracted other investors who had watched the episode and recognized the opportunity that the sharks had missed.
Among those who took notice was Richard Branson, the billionaire founder of Virgin Group. Branson saw a Ring device in action on his private island and was immediately impressed with its potential. He became an investor, contributing to a $28 million funding round that would grow into more than $200 million in total investment over subsequent rounds.
Basketball legend Shaquille O'Neal also joined as both an investor and brand ambassador in 2016, lending his considerable fame and credibility to Ring's marketing efforts. Shaq's involvement helped position Ring as a mainstream consumer brand rather than a niche technology product.
Rebranding to Ring
On September 26, 2014, the company was rebranded from Doorbot to Ring as it launched its second-generation hardware. The new name was catchier, more intuitive, and suggested the familiar ring of a doorbell while avoiding the robotic connotations of the original name.
The rebrand coincided with significant product improvements and expanded distribution. With backing from investors like Branson and partnerships with manufacturing giant Foxconn (which also produced Apple's iPhones), Ring was able to refine its product design, improve reliability, and scale production to meet growing demand.
Amazon acquisition
In February 2018, Amazon announced the acquisition of Ring for approximately $1.2 billion (some reports cite figures ranging from $1 billion to $1.8 billion). The acquisition was one of Amazon's largest to date and signaled the e-commerce giant's serious commitment to the smart home market.
For Siminoff, who reportedly owned approximately 30% of the company at the time of the sale, the acquisition provided a pre-tax windfall estimated at $300-400 million. Just five years after being rejected on Shark Tank for a $7 million valuation, he had sold his company for more than 170 times that amount.
Kevin O'Leary, reflecting on the outcome, acknowledged that passing on Doorbot was "probably the biggest miss" in Shark Tank history. The story became a cautionary tale about the difficulty of predicting which startups will succeed and the risks of passing on unconventional ideas.
Post-acquisition: Integrating Ring into Amazon
Following the acquisition, Siminoff remained with Ring as CEO, leading the integration of the company into Amazon's broader smart home strategy, which also included products like Alexa voice assistants and Echo devices. Under Amazon's ownership, Ring expanded its product line beyond video doorbells to include security cameras, alarm systems, and other home security products.
The company also grew dramatically in market reach. By 2023, more than 10 million people had Ring doorbells installed, and the devices had become a common sight on front porches across America and beyond.
Departure and return
In May 2023, after approximately five years integrating Ring into Amazon, Siminoff announced his departure from the company. The departure was described as amicable, with Siminoff having achieved the goals he had set for the post-acquisition integration period.
However, Siminoff's departure from Ring was not permanent. In 2025, he returned to Amazon as Vice President overseeing Ring and several other smart home initiatives. In a memo to staff, he outlined an ambitious vision: "We are reimagining Ring from the ground up with AI first." This pivot toward artificial intelligence reflected broader industry trends and Siminoff's continued drive to innovate and evolve the company he had founded.
Shark Tank: From reject to shark
Return as a guest investor
In one of the most remarkable full-circle moments in television history, Jamie Siminoff returned to Shark Tank in 2018 as a guest investor for the Season 10 premiere—the show's 200th episode. He became the first person in the show's history to transition from a rejected contestant to an investor seated in the sharks' chairs.
The return was laden with symbolism and provided powerful television. Siminoff sat alongside the same investors who had passed on his company just five years earlier, now as their peer rather than a supplicant seeking their approval. The transformation from rejected entrepreneur to billionaire success story embodied everything the show purported to celebrate about American entrepreneurship.
Investment philosophy
When asked about his approach to evaluating potential investments on Shark Tank, Siminoff emphasized the importance of founder commitment and passion over purely financial metrics. "I'm looking for that person that is just so committed, so excited, so passionate about what they're doing that no matter what they'll make that business work through the hard times and through the good times," he explained.
This philosophy reflected his own experience building Ring—the years of setbacks, rejections, and near-failures that he overcame through sheer determination. He understood that business plans and financial projections were less important than the founder's willingness to do whatever it took to succeed.
Notable investments
One of Siminoff's most significant Shark Tank investments was in Moink, a subscription-based meat delivery company founded by Lucinda Dinneen. Siminoff invested $400,000 for 20% equity, beating out offers from other sharks.
The deal proved successful. Following the episode, Moink's revenue jumped from $730,000 in 2018 to $2.8 million in 2019, and by mid-2021, the company was on track to reach $7.4 million in annual revenue. The investment demonstrated Siminoff's ability to identify promising companies and contribute to their growth.
Controversies
Privacy and surveillance concerns
Ring's success has been accompanied by significant controversy regarding privacy, surveillance, and the company's relationships with law enforcement agencies. Critics have raised concerns that Ring's millions of cameras effectively constitute a distributed surveillance network that poses risks to civil liberties.
Police partnerships
Ring previously partnered with more than 2,000 police departments across the United States, allowing law enforcement officers to request footage from Ring cameras through the Neighbors app without obtaining a warrant. This arrangement alarmed privacy advocates who argued it facilitated warrantless surveillance and could have chilling effects on free expression and political activity.
In response to sustained criticism, Ring ended the direct police request feature in 2024, though law enforcement can still obtain Ring footage through standard legal processes.
FTC settlement
In 2023, the Federal Trade Commission secured a $5.8 million settlement from Ring over privacy lapses. The FTC found that Ring employees and contractors had "broad and unrestricted access" to customer video recordings, raising serious concerns about data security and privacy protections.
The 2026 Super Bowl ad controversy
In February 2026, Ring aired a Super Bowl advertisement narrated by Siminoff that showcased the company's "Search Party" feature—an AI-powered capability that can scan saved footage from outdoor Ring cameras to help find missing pets. While the ad was intended to highlight a helpful feature, it sparked immediate backlash from privacy advocates.
Conservative commentator Stephen L. Miller called the ad "propaganda for mass surveillance." Former New York City comptroller Brad Lander warned "they can do this to anyone," and GOP strategist Brady Smith described the spot as "awfully dystopian." The reaction highlighted ongoing public concerns about the surveillance implications of Ring's technology and the expanding capabilities enabled by artificial intelligence.
Electronic Frontier Foundation criticism
The Electronic Frontier Foundation has been among Ring's most vocal critics, calling the company's technology "a grave threat to civil liberties." The EFF has documented instances where police used Ring footage to spy on protestors and obtained footage without warrants or user consent.
When Siminoff announced plans to reimagine Ring "AI first," the EFF expressed concern that this might signal the introduction of video analytics or facial recognition capabilities, further expanding the surveillance potential of the devices.
Siminoff's response
Siminoff has consistently defended Ring against privacy criticisms, emphasizing that customers maintain control over their data and footage. "It's their data. They control it," he has stated, arguing that Ring gives "100% control" to customers over their recordings and privacy settings.
Regarding footage retention, Siminoff has clarified: "If you delete a recording or if you don't want a recording, you don't have a subscription. We do not have it stored." These assurances, however, have not fully satisfied critics who remain concerned about the broader societal implications of widespread video surveillance.
Post-Ring ventures
Latch/DOOR
After leaving Amazon in 2023, Siminoff did not retire from entrepreneurship. He became CEO of Latch, Inc., a smart access company that provides keyless entry systems and building management software for residential buildings, particularly multifamily apartment complexes.
Under Siminoff's leadership, Latch announced plans to rebrand as DOOR, reflecting an expanded vision beyond simple access control. The company opened a 62,000+ square foot headquarters and warehouse in St. Louis, Missouri, employing more than 50 team members and signaling Siminoff's interest in building outside traditional tech hubs.
In November 2024, Latch announced that Siminoff would transition from his CEO role to an advisory position called "Doorman," effective January 1, 2025. This transition allowed Siminoff to maintain involvement with the company while pursuing other interests.
"Ding Dong" memoir
On November 10, 2025, Siminoff published his memoir, Ding Dong: How Ring Went From Shark Tank Reject to Everyone's Front Door, co-written with Andrew Postman. The book recounts the complete story of building Ring—from the garage invention to the Shark Tank rejection to the billion-dollar Amazon acquisition—with all the chaos, failures, and unexpected twists along the way.
The book received endorsements from notable figures including Jeff Bezos, who praised Siminoff as "a real builder—scrappy, original, and unsatisfied by the status quo," and Kevin O'Leary, who acknowledged that not investing in Doorbot was a major mistake.
Personal life
Marriage and family
Jamie Siminoff married Erin Lindsey on October 7, 2006. Erin is a former executive at 20th Century Fox, having graduated from Pepperdine University before working at 20th Century Fox Film Corporation. The couple resides in Los Angeles, California.
Erin has been a consistent supporter throughout Siminoff's entrepreneurial journey, including during the difficult years of building Ring when success was far from certain. It was Erin who first validated the Ring concept, telling Jamie that the device was a game-changer and made her feel safer—feedback that gave him confidence to pursue the venture.
Son Oliver and medical advocacy
The couple has one son, Oliver, who was born with galactosemia, a rare genetic disorder that affects the body's ability to process galactose (a sugar found in dairy products). The condition was diagnosed early in Oliver's life, and proper treatment began within four days of his birth.
Oliver's diagnosis motivated Siminoff to become involved in medical research and advocacy. He has partnered with doctors at Boston Children's Hospital and Harvard to create the Galactosemia Stem Cell Research project, focusing efforts on finding treatments or a cure for the condition. This philanthropic involvement represents a deeply personal mission beyond his business ventures.
Cancer research advocacy
In 2021, Siminoff partnered with Dr. Santosh Kesari, a neuro-oncologist, to pursue research toward a cure for cancer. This initiative was motivated by his father's diagnosis of glioblastoma, a rare and aggressive form of brain cancer. The experience of watching his father battle the disease drove Siminoff to apply his resources and problem-solving approach to medical research.
Business philosophy
Throughout his career, Siminoff has articulated a distinctive approach to entrepreneurship that emphasizes several key principles:
Work ethic over work-life balance
Siminoff has been vocal about his skepticism toward the concept of work-life balance, arguing that building successful companies requires extraordinary commitment and sacrifice. "Work-life balance is a myth," he has stated, reflecting his own experience of total immersion in building Ring.
Persistence in the face of rejection
The Shark Tank rejection became a foundational element of Siminoff's philosophy—proof that external validation is neither necessary nor sufficient for success. He encourages entrepreneurs to use rejection as motivation rather than discouragement, channeling the energy of proving doubters wrong into productive effort.
Mission-driven entrepreneurship
Siminoff describes himself as a "mission-driven entrepreneur," emphasizing that the most successful companies are built around genuine purposes rather than purely financial motivations. At Ring, the mission was to make neighborhoods safer—a goal that resonated with customers and employees alike and provided motivation during difficult times.
See also
References