Sam Altman, the chief executive of OpenAI, is 41 years old as of October 2026. Born on April 22, 1985, in Chicago, Altman has become one of the most recognizable figures in the artificial intelligence boom — the man steering the company behind ChatGPT through funding rounds that have pushed OpenAI's valuation past $850 billion. Despite sitting at the center of the biggest technology story of the decade, he famously owns no equity in OpenAI, having built his fortune through years of early-stage investing before the chatbot era ever began.
Quick Facts
| Detail | Info |
|---|---|
| Full Name | Samuel Harris Altman |
| Born | April 22, 1985 |
| Age | 41 (as of October 2026) |
| Birthplace | Chicago, Illinois, USA |
| Occupation | CEO of OpenAI; Entrepreneur; Investor |
| Nationality | American |
| Height | Around 5 ft 9 in (175 cm; not officially confirmed) |
| Spouse | Oliver Mulherin (married January 2024) |
| Children | One son (born via surrogacy, February 2025) |
| Estimated Net Worth | Around $3.3 billion (Forbes, September 2026 estimate) |
Early Life and Career
Sam Altman was born Samuel Harris Altman in Chicago and raised in the suburbs of St. Louis, Missouri, where he developed an early fascination with computers. As a teenager he received his first computer and quickly taught himself to program, a hobby that soon consumed his life. He attended John Burroughs School in St. Louis before heading to Stanford University, where he studied computer science.
Altman never finished his degree. He dropped out of Stanford in 2005 to co-found Loopt, a location-based social networking app for mobile phones — an ambitious idea launched before the iPhone even existed. Loopt raised tens of millions of dollars in venture capital but never broke through commercially. It was eventually acquired by Green Dot Corporation in 2012 for $43 million, a modest exit that nonetheless established Altman's reputation as a founder who could raise money and ship products.
While running Loopt, Altman had begun angel investing, and his talent for spotting promising startups pulled him into Y Combinator. He joined the prestigious startup accelerator as a part-time partner in 2011 and rose to become its president in 2014, a role he held until 2019. During his tenure, Y Combinator became the most influential early-stage program in Silicon Valley, backing companies like Airbnb, Stripe, and Dropbox in earlier batches, and Altman's network of founders and investors grew into one of the most valuable Rolodexes in tech.
In 2019, Altman became CEO of OpenAI, the artificial intelligence research lab he had co-founded in 2015 alongside Elon Musk and others. At the time, OpenAI was a relatively obscure nonprofit. Under Altman's leadership, it pivoted to a "capped-profit" model to attract the enormous investment required to train frontier AI models. The bet paid off spectacularly: the launch of ChatGPT in late 2022 triggered a global AI frenzy, turned OpenAI into one of the world's most valuable private companies, and made Altman a household name.
His tenure has not been without drama. In November 2023, OpenAI's board abruptly fired Altman, citing concerns about his candor with directors. The dismissal set off a revolt — nearly all of OpenAI's employees threatened to quit — and within four days Altman was reinstated as CEO, with the board largely replaced. An independent review later concluded the firing was not warranted.
Since then, OpenAI has released a rapid succession of models, including GPT-5 in August 2025 and subsequent versions such as GPT-5.6 in mid-2026. The company has also pursued colossal infrastructure projects, including the Stargate venture for building out AI data centers. On the business side, OpenAI closed a record $122 billion funding round at an $852 billion valuation in March 2026, and by September 2026 reports emerged of investor talks for another round valuing the company around $1.4 trillion. Altman has said publicly that OpenAI will not go public in 2026, putting safety work ahead of an IPO.
Personal Life
Altman married Australian software engineer Oliver Mulherin in a private seaside ceremony in Hawaii in January 2024. Mulherin, who has worked at companies including Meta and several AI startups, is known as a supportive and low-key presence alongside his high-profile husband. The couple lives in San Francisco's Russian Hill neighborhood and spends weekends at a ranch in Napa Valley.
In February 2025, the couple welcomed their first child — a baby boy born via surrogacy. Altman announced the birth on X, sharing that his son had arrived early and was spending time in the NICU, along with his feelings about new fatherhood. He has described becoming a father as the most meaningful event of his life and says it rewired his priorities. He also admitted he relies heavily on ChatGPT for parenting advice.
Altman and Mulherin are among Silicon Valley's notable philanthropists: in May 2024 they signed The Giving Pledge, committing to donate the majority of their wealth to charitable causes. Despite his fame, Altman maintains a relatively quiet private life, rarely sharing family photos and preferring long-form writing on his personal blog to the spotlight.
Net Worth
Sam Altman's estimated net worth is about $3.3 billion, according to Forbes' September 2026 estimate — though figures vary widely by source, with some estimates running higher. What makes his fortune unusual is its source: Altman holds no equity in OpenAI and reportedly earns a salary of only about $76,000 as its CEO. His wealth was built almost entirely before the ChatGPT boom through two decades of early-stage investing.
His portfolio includes stakes in companies spanning nuclear fusion (Helion Energy), digital payments (Stripe), longevity research (Retro Biosciences), identity infrastructure (Tools for Humanity, the company behind Worldcoin), and dozens of other startups through his personal fund Hydrazine Capital and his Y Combinator-era investments. He was also an early investor in Reddit. These long-term bets compounded quietly for years and then surged as AI and frontier technology captured the markets. Altman has also invested in real estate and nuclear startup Oklo.
Because so much of his wealth sits in private, early-stage companies, his net worth fluctuates with funding rounds and market sentiment — but the trajectory has been consistently upward through the AI boom.
Frequently Asked Questions
How old is Sam Altman?
Sam Altman is 41 years old as of October 2026. He was born on April 22, 1985, in Chicago, Illinois, and grew up in the St. Louis area of Missouri.
Who is Sam Altman's wife?
Sam Altman is married to Oliver Mulherin, an Australian software engineer who previously worked at Meta and several AI startups. The couple wed in an intimate beach ceremony in Hawaii in January 2024. They have one son, born via surrogacy in February 2025.
Is Sam Altman still the CEO of OpenAI?
Yes. Sam Altman remains the CEO of OpenAI as of October 2026, a role he has held since 2019 apart from a brief four-day removal in November 2023. In October 2026 he ruled out an OpenAI IPO that year, saying safety work must come first.
What is Sam Altman's net worth?
Forbes estimated Sam Altman's net worth at around $3.3 billion in September 2026. Notably, his fortune does not come from OpenAI — he holds no equity in the company — but from years of early investments in companies like Stripe, Helion Energy, Reddit, and Worldcoin's parent company.
Where did Sam Altman go to college?
Sam Altman studied computer science at Stanford University but dropped out in 2005 to co-found the mobile startup Loopt. He later became president of Y Combinator (2014–2019) before taking the CEO role at OpenAI.