Fired and rehired in 5 days. 100M users in 2 months. $157B valuation.
Sam Altman catapulted to global fame faster than any CEO on this list—including #6 Jeff Bezos—by launching ChatGPT, which hit 100 million users in just 60 days, 33% faster than TikTok's record. That blistering adoption rate triggered a boardroom crisis: his firing in November 2023, a Microsoft job offer, mass employee revolt, and reinstatement within five days—a saga more gripping than the boardroom drama of #7 Elizabeth Holmes. OpenAI's $157 billion valuation now cements him as AI's defining figure. The 100-million-user milestone in two months remains the fastest consumer app adoption ever, outpacing Instagram and TikTok. His rollercoaster week made him more recognizable than the company itself, a case study in how a CEO's personality can eclipse a brand.
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