Sam Altman is (1) the CEO of OpenAI, (2) the executive who steered the launch of ChatGPT in November 2022, (3) the former president of startup accelerator Y Combinator, (4) a billionaire venture investor worth an estimated $2 to $3.3 billion as of May 2026, and (5) one of the most influential people in artificial intelligence. Sam is 41 years old und 5 feet 6 inches tall. He was born to a Jewish family in Chicago on April 22, 1985. He has been married to Australian software engineer Oliver Mulherin since January 2024.
This article covers Sam Altman’s full biography in one place. It runs from his Stanford dropout days and his first startup Loopt, through his years running Y Combinator, to his current role at OpenAI. That role now spans the $852 billion valuation push, the Musk v. OpenAI trial, and the looming 2026 IPO. You will also get straight answers about his net worth, family, husband, religion, and the famous November 2023 firing that lasted five days.
The Key Takeaways
- Sam Altman has been CEO of OpenAI since 2019, and co-founded the company in 2015 with Elon Musk, Greg Brockman, Ilya Sutskever and others.
- His net worth is $2 to $3.3 billion as of May 2026, despite owning zero direct equity in OpenAI.
- He was fired and rehired in five days in November 2023 after the OpenAI board removed him on November 17 and reinstated him on November 22.
- He married software engineer Oliver Mulherin auf January 10, 2024 in Hawaii; the couple welcomed their first son in 2025.
- His wealth comes from 400+ venture investments, including a 9% pre-IPO stake in Reddit and a $1.6 billion+ stake in Helion Energy.
Sam Altman Quick Facts: Age, Height, Religion, Hometown
| Detail | Value |
|---|---|
| Full name | Samuel Harris Altman |
| Born | April 22, 1985, Chicago, Illinois |
| Age | 41 (May 2026) |
| Height | 5’6″ (170 cm) |
| Religion | Jewish (cultural) |
| Hometown | St. Louis, Missouri |
| Education | Stanford University (dropout, 2005) |
| Current role | CEO, OpenAI (since 2019) |
| Husband | Oliver Mulherin (married Jan 2024) |
| Net worth | $2 to $3.3 billion (May 2026) |
Sam Altman’s Family and Early Life
He is the eldest of four children. His mother, Connie Gibstine, is a dermatologist. His father, Jerry Altman, was a real estate broker who died in May 2018. Sam grew up in the St. Louis suburbs in a Jewish household. He has two younger brothers, Max und Jack, and one younger sister, Annie Altman, who is nine years his junior.
At age eight, Altman received his first computer, an Apple Macintosh. He began coding and disassembling hardware on his own. His brother Jack Altman later co-founded Lattice, a people-management software company. Jack also founded Hydrazine Capital, the venture fund where Sam has parked a sizable share of his angel-investing money. Jack officiated Sam’s wedding in 2024.
Altman has spoken publicly about coming out as gay in his teenage years while at John Burroughs. He has credited that experience with shaping his worldview and his discomfort with conformity.
Annie Altman: The Sister Lawsuit
Annie Altman is Sam’s only sister. She filed a civil lawsuit against him in January 2025 in the U.S. District Court for the Eastern District of Missouri. The suit alleges sexual abuse beginning when she was three years old. Sam, his mother Connie, and his brothers Max und Jack issued a joint statement denying the allegations. They called the claims “utterly untrue.”
Annie graduated from Tufts University with a degree in biopsychology. She has worked as an artist, podcast host, and certified yoga instructor. She has been publicly estranged from her brother for years. The case remains pending in federal court as of May 2026. Fello AI does not editorialize on the merits of the lawsuit. This section exists because it is one of the most-searched topics about Altman, and readers deserve the basic facts.
Education: From John Burroughs to Stanford Dropout
Sam Altman attended John Burroughs School in Ladue, Missouri, a private K-12 school. Sam then enrolled at Stanford University in 2003 to study computer science. He dropped out in 2005, at age 19, to launch his first company. He never returned to complete his degree.
Stanford has since become one of the most-referenced credentials in his career story. He joins a long tradition of Stanford-affiliated tech founders who left before finishing their degrees. That list includes the founders of dozens of YC-backed startups. Altman has said he envies students dropping out now to build AI companies. He compares the current moment to his own 2005 decision.
Loopt: Sam Altman’s First Startup
Loopt was Sam Altman’s first company. It was a location-based social networking mobile app. He co-founded it in 2005 at age 19, alongside Stanford classmates Nick Sivo (his then-boyfriend) and Alok Deshpande. The startup was admitted into the first-ever batch of Y Combinator in summer 2005. That milestone would shape Altman’s entire career.
As CEO, Altman raised more than $30 million in venture capital for Loopt. Investors included Sequoia Capital und Y Combinator itself. The app pre-dated Foursquare, Find My Friends, and modern location-sharing by years. Still, it struggled to attract a mass-market audience in the pre-smartphone era.
In March 2012, Loopt was acquired by Green Dot Corporation for $43.4 million. The exit was modest by Silicon Valley standards. Still, it gave Altman the capital and credibility to become a full-time investor.
Y Combinator: From Partner to President (2011-2020)
Sam Altman joined Y Combinator as a part-time partner in 2011, while still running Loopt. He became its President in February 2014, succeeding founder Paul Graham. Under Altman, YC scaled from a small Silicon Valley accelerator into a global startup machine. It funded close to 1,900 companies during his tenure.
YC under Altman backed some of the biggest names in modern tech. They include Airbnb, Stripe, DoorDash, Instacart, Reddit, Coinbaseund Twitch. Altman personally invested in many of those rounds. That venture portfolio today accounts for the bulk of his personal net worth.
He stepped back as YC president in March 2019 to focus full-time on OpenAI. His formal relationship with Y Combinator was terminated in early 2020.
OpenAI: Co-Founder, CEO, and the ChatGPT Era
Sam Altman co-founded OpenAI in December 2015. His co-founders included Elon Musk, Greg Brockman, Ilya Sutskever, Wojciech Zarembaund John Schulman. The group made an initial $1 billion pledge to build artificial general intelligence “for the benefit of all of humanity.” OpenAI launched as a non-profit research lab. Altman became its CEO in March 2019. By then the company had restructured into a “capped-profit” entity to attract the capital needed to compete with Google.
Want the deeper story of who built ChatGPT and when? FelloAI’s dedicated explainer covers it in full at Who Created ChatGPT? The Full Story Behind OpenAI.
Co-Founding OpenAI in 2015
Altman’s role at the founding was co-chair alongside Elon Musk. Brockman served as CTO and Sutskever as Chief Scientist. Musk departed the OpenAI board in February 2018, citing potential conflicts with Tesla’s AI work. That was four years before ChatGPT became a household name. In court testimony in May 2026, Altman said Musk had wanted control of the company. He said Musk pushed for “more than 90%” of the new for-profit structure before walking away.
ChatGPT and the AI Boom
OpenAI launched ChatGPT on November 30, 2022. The product hit 1 million users in five days und 100 million monthly users in two months. That made it one of the fastest-growing consumer products in history. By February 2026, Altman told employees ChatGPT was again exceeding 10% monthly growth. It had more than 800 million weekly active users.
ChatGPT’s success catapulted Altman from respected Silicon Valley figure to global celebrity. He testified before the U.S. Senate Judiciary Subcommittee on AI oversight in May 2023. He has been named to Time’s 100 Most Influential People repeatedly. He now sits at the center of every major AI policy debate.
Fired and Rehired in Five Days (November 2023)
On November 17, 2023, the OpenAI board fired Sam Altman. It stated he was “not consistently candid in his communications with the board.” The decision triggered five days of public chaos. Co-founder Greg Brockman resigned in solidarity within hours. Then more than 700 of OpenAI’s roughly 770 employees signed a letter threatening to quit unless Altman returned.
Here is the day-by-day timeline of one of the most dramatic boardroom sagas in tech history.
| Date | Event |
|---|---|
| Nov 17, 2023 (Fri) | OpenAI board fires Altman; Mira Murati named interim CEO. Brockman resigns. |
| Nov 19, 2023 (Sun) | Former Twitch CEO Emmett Shear named interim CEO. |
| Nov 20, 2023 (Mon) | Microsoft CEO Satya Nadella announces Altman and Brockman will join Microsoft; 700+ of OpenAI’s 770 employees sign a letter demanding Altman’s return. |
| Nov 21, 2023 (Tue) | Altman reaches a deal to return; new board agreed. |
| Nov 22, 2023 (Wed) | Altman officially reinstated as CEO; new board led by Bret Taylor (former Salesforce co-CEO). |
Musk v. OpenAI Trial (May 2026)
Sam Altman took the stand on May 12, 2026 in Oakland federal court. The case is Elon Musk’s lawsuit against OpenAI. It alleges that Altman, Brockman, and Microsoft “stole a charity” by converting the original non-profit into a for-profit enterprise. Altman testified that Musk had abandoned OpenAI in 2018 when he could not gain control of the company. Under cross-examination, he called himself “an honest and trustworthy businessperson.”
During the trial, Altman disclosed under oath that he owns no direct equity in OpenAI. He also said his stake in Helion Energy alone was worth more than $1.6 billion at the end of 2025. Microsoft executives testified that they had worried internally about being “too dependent” on OpenAI. The trial remains active as of mid-May 2026.
Sam Altman’s Net Worth in 2026 ($2 to $3.3 Billion)
Sam Altman’s net worth is estimated at $2 to $3.3 billion as of May 2026, according to Bloomberg und Forbes. He debuted on the Bloomberg Billionaires Index in March 2024 at $2 billion. His disclosed Helion stake alone of $1.6 billion+ anchors the lower end of current estimates.
Altman has no direct equity in OpenAI, confirmed under oath during the Musk trial in May 2026. His wealth is entirely venture-investment-driven. He built it across more than a decade as an angel investor, Y Combinator partner, and personal-fund operator. He has invested in more than 400 companies to date.
| Source / Asset | Estimate | Date | Basis | Status |
|---|---|---|---|---|
| Bloomberg Billionaires Index | $2 billion | March 2024 (debut) | Public portfolio estimate | Confirmed |
| Forbes | $2 to $3 billion | 2026 | Investment portfolio | Updated regularly |
| Helion Energy stake | $1.6 billion+ | End of 2025 | Disclosed under oath | Verified court testimony |
| Reddit (pre-IPO) | 8.7% ownership, ~$435M stake | February 2024 | Third-largest shareholder pre-IPO | Verified S-1 filing |
| OpenAI direct equity | $0 | May 2026 | Disclosed under oath | Confirmed |
How Sam Altman Made His Money
Altman’s wealth comes from venture capital, not from running OpenAI. During his years at Y Combinator, he personally invested in Reddit, Airbnb, Stripe, Instacart, DoorDash, Asanaund Uber. He also runs his own venture funds. He has been a personal cheque-writer in growth rounds for Helion Energy, Retro Biosciencesund Tools For Humanity, the company behind Worldcoin.
His most famous bet is Airbnb, where he invested $100,000 in 2008. His most lucrative recent bet is Helion, a fusion-energy startup. He serves as its chairman and holds a stake worth more than $1.6 billion as of the end of 2025.
Sam Altman’s Salary at OpenAI
Sam Altman’s most recent disclosed OpenAI salary is $76,001 per year, up from $73,546 in 2022, per a federal filing. He has said he draws “whatever the minimum for health insurance is.” Altman does not need an OpenAI paycheck because of his investment income. He owns no direct equity in the company.
Sam Altman’s Personal Life: Husband, Marriage, and Son
Sam Altman is married to Oliver Mulherin, an Australian-born software engineer. Mulherin has worked at Meta and on AI-adjacent projects including the IOTA Foundation, Broadwingund Spark Neuro. The couple were first seen together publicly at a White House event in 2023. They married in a private seaside ceremony in Hawaii on January 10, 2024. Altman’s brother Jack Altman officiated.
The wedding took place near Altman’s Hawaii estate on the Big Island. He reportedly bought that property for $43 million in 2021. The ceremony was kept intentionally small, with only close family and friends in attendance. Mulherin captioned the couple’s Instagram announcement, “married my best friend and love of my life.”
A Son Born in 2025
Sam and Oliver welcomed their first son in February 2025 via surrogacy. The baby spent time in the NICU after being born prematurely. Altman has called fatherhood the experience that most changed his thinking about AI safety. Becoming a parent, he has said, sharpened his focus on what AI capabilities his son will grow up with.
Is Sam Altman Gay?
Yes. Sam Altman is openly gay. He came out as a teenager while attending John Burroughs in St. Louis. Sam has been a quiet but consistent supporter of LGBTQ+ causes for years. He is one of the most prominent openly gay CEOs in tech, alongside Apple’s Tim Cook.
Controversies Around Sam Altman
Sam Altman is one of the most polarizing figures in modern technology. His career carries several active controversies beyond his sister’s lawsuit and the November 2023 firing. Three of the most prominent are summarized below.
Worldcoin and Tools For Humanity is the eye-scanning biometric ID project he co-founded in 2019. Regulators in Kenya, Spain, Germany, France, Argentina, Portugal, and South Korea have all acted against it. They have suspended Worldcoin operations or opened privacy investigations. The concerns center on iris-scan data collection and informed consent.
The OpenAI non-profit-to-for-profit conversion is the core of Musk’s 2024-2026 lawsuit. Critics argue the restructure betrayed OpenAI’s founding mission to build AI “for the benefit of all of humanity.” Altman counters that it was the only way to raise the capital required to build safe and powerful AI at scale.
The April 10, 2026 attack on Altman’s home drew international attention. Someone threw a molotov cocktail at his San Francisco residence at around 4 a.m., setting fire to an exterior gate. A 20-year-old Texas man, Daniel Moreno-Gama, was arrested and charged with two counts of attempted murder and attempted arson. Prosecutors said he had traveled from Texas intending to kill Altman and had warned of “humanity’s extinction from AI.” A second incident at the same property involving gunfire was reported within days.
What Sam Altman’s Story Means for AI Users
Sam Altman’s career arc, from Stanford dropout to OpenAI CEO, mirrors the rise of consumer AI itself. Every product decision he makes at OpenAI shapes the tools millions of people use every day. That ranges from ChatGPT and GPT-5.5 to Sora and the upcoming agent features. Understanding the man behind the company is useful context whenever you read about a new ChatGPT release, a pricing change, or an AI policy fight.
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FAQ
Who is Sam Altman?
Sam Altman is the CEO of OpenAI, the company behind ChatGPT. He co-founded OpenAI in 2015 with Elon Musk, Greg Brockman, and Ilya Sutskever. Has been CEO since 2019. He is a Stanford dropout and the former president of Y Combinator. Sam Altman is a billionaire venture investor worth an estimated $2 to $3.3 billion as of May 2026.
What is Sam Altman’s net worth?
Sam Altman’s net worth is estimated at $2 to $3.3 billion in May 2026, per Bloomberg and Forbes. His wealth comes almost entirely from venture investments in companies like Reddit, Airbnb, Stripe, Helion Energy, and Worldcoin. Sam Altman’s Helion stake alone is worth more than $1.6 billion. His direct equity in OpenAI is zero, confirmed under oath in May 2026.
Who is Sam Altman’s wife?
Sam Altman does not have a wife. He is married to Oliver Mulherin, an Australian software engineer who has worked at Meta and several AI startups. They married on January 10, 2024 in a small seaside ceremony in Hawaii, with Sam’s brother Jack officiating. They welcomed their first son in early 2025.
Why was Sam Altman fired from OpenAI?
The OpenAI board fired Altman on November 17, 2023, citing that he was “not consistently candid in his communications with the board.” More than 700 of OpenAI’s 770 employees then signed a letter demanding his return, and Microsoft offered him a job leading a new AI division. The board reversed course and reinstated him as CEO on November 22, 2023, with a new board led by Bret Taylor. The full reasons for the original firing have never been publicly detailed.
Does Sam Altman own OpenAI?
No. Sam Altman owns no direct equity in OpenAI. He confirmed this under oath during the Musk v. OpenAI trial in May 2026. His most recent disclosed annual salary at OpenAI is $76,001, and his real wealth comes from outside venture investments. OpenAI is held primarily by Microsoft (~27% economic interest), employees, and other backers.
