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Author, psychologist, and economist. Notable for his work on the psychology of judgment and decision-making, as well as behavioral economics. Recipient of the 2002 Nobel Memorial Prize in Economic Sciences (shared with Vernon L. Smith).
Internet entrepreneur, philanthropist, and programmer. Co-founder and former CEO of Twitter, Inc., co-founder, principal executive officer, and chairperson of Block, Inc. Also a co-founder of Bluesky, PBLLC.