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In early 2019, senior Microsoft leadership began coming through the OpenAI office. First came Kevin Scott, the tech giant’s excitable chief technology officer, who had followed OpenAI and grown particularly fond of the startup; then came Craig Mundie, a senior adviser to Nadella who had served on Microsoft leadership, including as its chief research and strategy officer, for over twenty years. Bill Gates also turned up, reserved and tight-lipped as usual, as he watched a series of demos. Most employees were left in the dark about Microsoft’s engagement. Altman told the small team working on the deal to keep knowledge of a possible investment limited.