Greg Brockman

Greg Brockman left MIT in 2010 to join Stripe, the payments company founded by classmate Patrick Collison, and became its first chief technology officer in 2013. After leaving Stripe in May 2015, Brockman met Sam Altman and Elon Musk and recruited the researchers who became OpenAI's founding team. The lab, announced in December 2015 with Brockman as CTO, first operated out of Brockman's living room. At the GPT-4 launch on 14 March 2023, Brockman photographed a pencil sketch of a joke website and had the model turn it into working HTML on the livestream.

Brockman also chaired the nonprofit board. On 17 November 2023 the board, as it fired Altman, also removed Brockman as chair; within hours came a resignation, then a Microsoft announcement naming Brockman co-lead of a new research group, and on 21 November a return to OpenAI alongside Altman. A sabbatical followed from August to November 2024, which Brockman called the "first time to relax since co-founding OpenAI 9 years ago."

At the Musk v. Altman trial in May 2026, Musk's lawyer read Brockman's 2017 journal entries to the jury and asked about a stake worth about 30 billion dollars. Brockman testified that the mission had "always been my primary motivation" and that Musk had wanted control of the company. The jury found Musk's claims time-barred on 18 May. That month OpenAI made Brockman's interim oversight of products permanent and merged ChatGPT and Codex into one product team; after Fidji Simo stepped down in July 2026, Brockman took formal charge of ChatGPT, go-to-market, enterprise sales and compute. On 3 September 2026 Brockman presented GPT-6 Astra and called its computer use the start of an "AGI era." Outside the company, Brockman is among the donors to Leading the Future, a super PAC that backs candidates favoring national AI rules over state-by-state laws.