Sam Altman — Notable For: CEO of OpenAI; previously president of Y Combinator; central figure in the commercialization of large language models

NoteThe source directly confirms all three components of the claim: (1) 'CEO of OpenAI' — confirmed in the opening paragraph and infobox; (2) 'previously president of Y Combinator' — confirmed as president from 2014 to 2019, with the relationship ending in early 2020; (3) 'central figure in the commercialization of large language models' — confirmed by the statement that Altman 'became a prominent figure of the AI boom' after becoming CEO in 2019, and by his supervision of ChatGPT's launch in November 2022, which is explicitly described as a major commercialization milestone. All facts are accurate and directly supported by the source text.