A New York Times profile traces how rationalism and effective altruism shaped Anthropic chief executive Dario Amodei's conviction that A.I. is dangerous enough that only he and like-minded technologists should build it, following him from Kurzweil's Singularity and GiveWell forums through OpenAI to founding Anthropic. His views have won admirers and drawn critics including Mark Zuckerberg and Jensen Huang, who call him a doomer seeking to centralize power.