Sam Altman

ex-YC, OpenAI; Startup Playbook, scale-laws-as-strategy

CEO of OpenAI, the organisation behind GPT-4 and ChatGPT, and former president of Y Combinator. Built OpenAI from a non-profit research lab into a multi-hundred-billion-dollar enterprise by treating scaling laws as a core strategic thesis. Authored the widely cited Startup Playbook, distilling YC's advice on product, growth, and fundraising into a canonical reference for founders.