Greg Brockman is an American entrepreneur, investor, and software engineer. He is the President, Chairman, and Co-Founder of OpenAI, a role he has held since co-founding the company in December 2015. At OpenAI, he led significant projects including OpenAI Gym and OpenAI Five, a Dota 2 bot. He was also instrumental in the development and unveiling of large language models, including GPT-2 in 2019 and GPT-4 in March 2023.