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

NoteAll three components of the claim are confirmed by the source: (1) CEO of OpenAI — confirmed as current role since 2019; (2) Previously president of Y Combinator — confirmed he was president from 2014 to 2019 before leaving in early 2020; (3) Central figure in the commercialization of large language models — confirmed by the statement that he 'became its CEO in 2019, a role that made him a prominent figure of the AI boom' and that he 'supervised the launch of ChatGPT in November 2022,' which is a major commercialization milestone for LLMs. The source directly supports all three elements of the 'Notable For' claim.