Microsoft Hires Sam Altman After OpenAI Fired Him as CEO, OpenAI Taps Ex-Twitch Chief Emmett Shear

After a flurry of weekend negotiations, Microsoft said it hired Sam Altman — just two days after the board of OpenAI ousted him as CEO — while OpenAI recruited Emmett Shear, most recently chief executive of livestreaming platform Twitch, to step into the CEO role. Altman will lead a new artificial-intelligence research team at Microsoft, alongside former OpenAI president Greg Brockman (who had quit after Altman was fired on Nov. 17), Microsoft CEO Satya Nadella announced in a post Sunday night. Microsoft previously announced plans to invest billions over several...