Samuel Harris Altman (born April 22, 1985) is an American entrepreneur and investor who has been the chief executive officer (CEO) of the artificial intelligence company OpenAI since 2019.
Altman attended Stanford University for two years before he dropped out and co-founded Loopt, a geosocial networking application for smartphones. Loopt was acquired by Green Dot Corporation for $43.4 million in March 2012. In 2011, Altman joined Y Combinator, a technology startup accelerator and venture capital firm, and was the company's president from 2014 to 2019. He is a billionaire, due to investments in over 400 companies including Reddit, Worldcoin, Helion Energy and Instacart.
Altman co-founded OpenAI in 2015 and became its CEO in 2019, a role that made him a prominent figure of the AI boom. He supervised the launch of ChatGPT in November 2022. In 2023, he was ousted by the organization's board of directors for not being "consistently candid". The move was met with significant backlash from employees and investors, resulting in Altman's reinstatement five days later and the formation of a new board.
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Early life
Altman was born in Chicago on April 22, 1985, to a Jewish American family. His mother, Connie Gibstine, is a dermatologist, and his father, Jerry Altman, was a real estate broker. He is the eldest of four siblings: he has two brothers, Max and Jack; and a sister, Ann. His paternal great-grandfather was born in Płock, Poland. In 1989, the Altman family moved to Jerry's hometown of Clayton, Missouri.
At eight, Altman received his first computer—an Apple Macintosh—and began learning how to code and disassemble and examine computer hardware. He attended John Burroughs School, a private institution in Ladue, Missouri. In 2005, after studying computer science for two years at Stanford University in Stanford, California, he dropped out without earning a bachelor's degree.
Business career
Early career
In 2005, at the age of 19, Altman co-founded Loopt, a location-based social networking mobile application. As CEO, he raised more than $30 million in venture capital for the company, including an initial investment of $5 million from Patrick Chung of Xfund and his team at New Enterprise Associates, followed by investments from Sequoia Capital and Y Combinator. The company bought geolocation data from cellular providers and attempted to make an early social network for users to see where their friends were in real time. The board of Loopt attempted, twice, to remove Altman from his role as CEO, but Altman's supporters defended him and stated the attempts were not serious. In March 2012, after Loopt failed to gain significant user traction, the company was acquired by the Green Dot Corporation for $43.4 million.
Y Combinator
In 2011, Altman became a partner at startup accelerator Y Combinator (YC), initially working on a part-time basis. In February 2014, he became president of YC, replacing YC co-founder Paul Graham, who had been his mentor. Altman aimed to expand YC to fund 1,000 new companies per year and sought to broaden the types of companies funded, particularly focusing on "hard technology" startups. In October 2015, Altman was involved in expanding YC's scope. He invested in multiple startups such as Stripe, Inc.. In September 2016, Altman's role at YC expanded to president of YC Group, which included Y Combinator and other units. By 2018, Altman's role at OpenAI made him less often present at YC, and several YC partners had complained to Graham that Altman was using his role to have the priority in investment opportunities. Graham said that Altman had agreed to leave YC, but was resisting in practice.
YC moved its headquarters to San Francisco in 2019. In March, Altman and YC began to falsely claim that Altman had transitioned from president to a less hands-on role as chairman of the board, allowing him to focus on OpenAI. Graham was "unambiguous that Altman was removed because of Y.C. partners' mistrust."
Investor
As of June 2024, Altman's investment portfolio includes stakes in over 400 companies, valued at around $2.8 billion. Some of these investments intersect with companies doing business with OpenAI, which has raised questions about potential conflicts of interest. OpenAI's chairman of the board, Bret Taylor, maintained that Altman has been transparent about his investments.
In April 2012, Altman co-founded Hydrazine Capital with his brother, Jack Altman. The initial $21 million fund included a large part of the $5 million he got from selling Loopt, but most came from Peter Thiel, his mentor and main backer in Silicon Valley. Sam Altman invested 75 percent of the money in Y-Combinator companies. In 2023, when Hydrazine launched its fourth fund, the University of Michigan endowment was the only outside investor. Its investments in Hydrazine were the largest the endowment has made. Altman debuted on the Bloomberg Billionaires Index in March 2024 with an estimated net worth of $2 billion, primarily from his venture capital funds related to Hydrazine Capital. He was invited to attend the Bilderberg Meeting in 2016, 2022, and 2023.
Altman has several other investments in companies including Humane, which was developing a wearable AI-powered device; Retro Biosciences, a research company aiming to extend human life by 10 years; Boom Technology, a supersonic airline developer; Cruise, a self-driving car company later acquired by General Motors; and Helion Energy, an American fusion research company.
During the COVID-19 pandemic, Altman helped fund and create Project Covalence to help researchers rapidly launch clinical trials in partnership with TrialSpark, a clinical trial startup. During the depositor run on Silicon Valley Bank in mid-March 2023, Altman provided capital to multiple startups. Altman invests in technology startups and nuclear energy companies. Some of his portfolio companies include Airbnb, Stripe, and Retro Biosciences. Along with Peter Thiel, Altman was an early seed investor in Minicircle, "a longevity biotech company focused on developing gene therapies to extend human lifespans." He also invested in charter city projects Próspera and Praxis, which have gotten additional financial support from author and former Coinbase CTO Balaji Srinivasan. Both cities have been associated by various publications and journalists with the Network State movement.
For eight days in 2014, Altman was the CEO of Reddit, a social media company, after CEO Yishan Wong resigned. On July 10, 2015, he announced the return of Steve Huffman as CEO. He remained on its board until 2022. Altman invested in multiple rounds of funding for Reddit (in 2014, 2015, and 2021). Prior to Reddit's initial public offering in 2024, Altman was listed as its third-largest shareholder, with around 9% ownership.
OpenAI
OpenAI was initially founded as a nonprofit organization by Altman, Greg Brockman, Elon Musk, Jessica Livingston, Peter Thiel, Microsoft, Amazon Web Services, Infosys, and YC Research. Altman tenaciously recruited Ilya Sutskever and Dario Amodei by giving them attention and offering YC stock. In his early conversations with Musk, he framed OpenAI as competing against Google's AI development. Google was far ahead; Musk and Altman modeled their strategy after the Manhattan Project with an emphasis on recruiting AI technology leaders and convincing the world that they were protecting against the AI threat.
When OpenAI launched in 2015, it had raised pledges for $1 billion. In 2019, OpenAI said that $130 million of the pledged funds had been collected. TechCrunch reported that YC Research never contributed any of their pledged funds.
Altman said in 2015 that they were partly motivated by concerns about AI safety and existential risk from artificial general intelligence. He said that open-source would reduce those risks, arguing that if everyone has access to powerful AI, its users would be able to counter a small minority of bad actors. Altman noted it would be a decades-long project that eventually surpasses human intelligence. Walter Isaacson opined that Altman had "Musk-like intensity".
In 2018, Musk, a long-time personal friend of Altman's, resigned from his Board of Directors seat, citing "a potential future conflict [of interest]" with his role as CEO of Tesla due to Tesla's AI development for self-driving cars. In February 2024, Musk sued OpenAI and Altman, alleging they broke the company's founding agreement by prioritizing profit over benefit to humanity. OpenAI executives, including Altman, dismissed these claims in a blog post. The post said that the startup received only $45 million from Musk instead of his pledged $1 billion, and that Musk proposed to merge it with Tesla.
In March 2019, Altman left Y Combinator and began focusing full-time as CEO of OpenAI. Through 2017, Brockman and Sutskever oversaw the day to day business and Altman touched base approximately once a week. Sutskever opposed Altman moving to an AI role because Altman's motivation were unclear and it opened the possibility of an "AI dictator". The three leaders made an informal agreement that Altman would step down if the other two requested. OpenAI planned to spend $1 billion "within five years, and possibly much faster". Altman stated that even a billion dollars may turn out to be insufficient, and that the lab may ultimately need "more capital than any non-profit has ever raised" to achieve artificial general intelligence (AGI).
Political engagement
Altman had contemplated running for governor of California in the 2018 election, but later decided not to enter. In 2018, Altman announced "the United Slate", a political project to improve U.S. housing and healthcare policy. In 2019, Altman held a fundraiser at his home in San Francisco for 2020 Democratic presidential candidate and fellow tech entrepreneur Andrew Yang. In May 2020, Altman donated $250,000 to American Bridge 21st Century, a super PAC supporting Democratic presidential candidate Joe Biden.
In 2021, Altman published a blog post titled "Moore's Law for Everything", which stated his belief that within ten years, AI could generate enough value to fund a universal basic income (UBI) of $13,500 per year to every adult in the United States. In 2024, he suggested a new kind of UBI called "universal basic compute" to give everyone a "slice" of ChatGPT's computing power. In an interview given to The Atlantic's CEO Nicholas Thompson in April 2026, Altman stated that he "no longer believe[s] in universal basic income as much as [he] once did".
In 2023, Altman was involved in boosting Representative Dean Phillips as he prepared a challenge to President Joe Biden for the Democratic nomination. On November 18, 2024, San Francisco Mayor-Elect Daniel Lurie named him to his transition team. In December 2024, Altman donated $1 million to the Inaugural Fund for President Donald Trump. Altman hosted a fundraiser in San Francisco on March 20, 2025, for Senator Mark Warner, a Democrat up for re-election in 2026 in Virginia.
On July 4, 2025, Altman said that he believed in "techno-capitalism" and found himself increasingly "politically homeless", criticizing the Democratic Party for no longer encouraging a "culture of innovation and entrepreneurship". In September 2025, Altman was interviewed by Tucker Carlson. The interview covered the death of former OpenAI researcher Suchir Balaji and the ideal moral alignment of AI.
Personal life
Altman has been a vegetarian since childhood. He is gay, which he first disclosed at 17 in high school, where he spoke out after some students objected to a National Coming Out Day speaker. He dated Loopt co-founder Nick Sivo for nine years. They broke up shortly after the company was acquired in 2012.
According to Keach Hagey, Altman met his future husband Oliver Mulherin "in Peter Thiel's hot tub at 3 a.m." in 2015. Mulherin was a computer science student at the University of Melbourne at the time and later became an engineer. He worked on AI projects in Australia before moving to the United States to work for the dementia detection startup SPARK Neuro. Altman married Mulherin in January 2024 at their estate in Hawaii; the couple also live in Russian Hill, San Francisco and often spend weekends in Napa, California. The couple has a son, who was born in 2025 via surrogacy.
Altman and Mulherin committed to giving away most of their wealth by signing The Giving Pledge in May 2024. Altman enjoys prepping and said in 2016, "I have guns, gold, potassium iodide, antibiotics, batteries, water, gas masks from the Israeli Defense Force, and a big patch of land in Big Sur I can fly to."
In January 2025, Altman's sister Ann Altman filed a lawsuit alleging sexual abuse by Altman in the U.S. District Court for the Eastern District of Missouri in St. Louis. The lawsuit alleges that the abuse started when Ann was aged 3 and Sam was 12, and that it continued "several times per week" between 1997 and 2006. According to Ann, the memories of abuse were lost but recovered through flashbacks in her adulthood. The lawsuit requests a jury trial and damages in excess of $75,000. Sam Altman, along with his mother Connie and younger brothers Max and Jack, issued a joint statement denying the allegations and claiming that Ann is mentally ill and "continues to demand money from us" despite being financially supported by the Altman family.
Altman has served on the board of three Hong Kong– and Singapore-based SPAC companies named Bridgetown (sponsored by Thiel Capital and Richard Li's Pacific Century) alongside Matt Danzeisen, chairman of the SPACs and spouse of Thiel. Like Danzeisen, Altman was mentioned as a friend in Thiel's circle by BuzzFeed News in 2017. He thanked Danzeisen for contributing to his essays on development of AI and China. At a birthday party Thiel organized for Danzeisen ("on a balmy mid-November evening" in 2023), Thiel warned Altman that half of Altman's subordinates at OpenAI, who had supposedly been "programmed" by Eliezer Yudkowsky, wanted to remove Altman.
