Sam Altman Biography: Age, OpenAI, Career & Net Worth

Sam Altman is the American entrepreneur and investor who, as chief executive of OpenAI, became the public face of the artificial-intelligence boom. Before ChatGPT made him famous worldwide, he was already one of Silicon Valley’s most connected figures — a Stanford dropout who ran Y Combinator, the start-up accelerator behind Airbnb, Stripe and Reddit.

Full Name	Samuel Harris Altman
Born	22 April 1985, Chicago, Illinois, USA
Age	41 (as of 2026)
Nationality	American
Occupation	Entrepreneur, investor; CEO of OpenAI
Known For	OpenAI and ChatGPT, Y Combinator, Loopt
Net Worth (est.)	Around $1.7 billion (Forbes est., 2025)

Table of Contents

Early Life and Education

Altman was born in Chicago and grew up in St. Louis, Missouri, where his mother worked as a dermatologist. He got his first computer at eight and attended John Burroughs School, a private prep school, before enrolling at Stanford University to study computer science. He left Stanford in 2005, aged 19, to found his first company. He has often said the two years at Stanford — and the network he built there — mattered more to his career than the degree he never finished.

Loopt, Y Combinator and the Investor Years

Altman’s first start-up, Loopt, offered a location-based social networking service for early smartphones. It raised more than $30 million in venture funding and was acquired in 2012 for about $43 million — a modest exit that nonetheless put Altman inside the rooms where Silicon Valley deals happen. He joined Y Combinator part-time in 2011 and succeeded founder Paul Graham as its president in 2014, running it until 2019. In parallel he invested his own money early in companies including Stripe, Reddit, Airbnb and the nuclear-fusion start-up Helion Energy, where he serves as chairman.

OpenAI and the ChatGPT Era

In 2015 Altman co-founded OpenAI as a non-profit research lab, alongside Elon Musk, Ilya Sutskever and others, with a stated mission to build safe, broadly beneficial artificial general intelligence. He became CEO in 2019 as the lab added a capped-profit arm and took a landmark investment from Microsoft. The launch of ChatGPT in November 2022 triggered a global AI race and made Altman the industry’s ambassador to governments worldwide. In November 2023 OpenAI’s board abruptly fired him; after an employee revolt and Microsoft’s intervention he was reinstated within five days, an episode that became a case study in AI governance. OpenAI’s reported valuation climbed into the hundreds of billions of dollars in 2025.

Sam Altman Net Worth

Forbes estimated Altman’s net worth at roughly $1.7 billion in 2025 — and, unusually for an AI chief executive, almost none of it comes from OpenAI itself. His salary there has been reported as modest, and he long held no equity in the company. The fortune instead comes from his decade as one of the valley’s busiest angel investors: early stakes in Stripe, Reddit (where he briefly served as interim CEO in 2014 and sat on the board until 2022), Helion and hundreds of smaller bets, many made through Y Combinator networks. As private-company stakes, these valuations are Forbes estimates and can change quickly.

Personal Life

Altman married Oliver Mulherin, an Australian software engineer, in January 2024, and the couple announced the birth of their first child, a son, in 2025. He divides his time between San Francisco and a ranch in Napa, California, has been a vegetarian since childhood, and is an avid reader and prepper who has written candidly about preparing for emergencies. He co-founded the identity project World (formerly Worldcoin) and remains one of the most interviewed voices on how AI will reshape work and society.

Frequently Asked Questions

How old is Sam Altman?

He was born on 22 April 1985, making him 41 years old in 2026.

What is Sam Altman’s net worth?

Forbes estimated about $1.7 billion in 2025, built mainly on early investments in companies such as Stripe, Reddit and Helion rather than on OpenAI.

Did Sam Altman found OpenAI?

He co-founded it in 2015 with Elon Musk, Ilya Sutskever and others, and has been its CEO since 2019.

Why was Sam Altman fired and rehired in 2023?

OpenAI’s board removed him in November 2023, citing communication concerns; after staff and investors pushed back, he returned as CEO within five days with a restructured board.