American psychiatrist and blogger — author of Slate Star Codex (2013–2020) and Astral Codex Ten (2021–) — the most influential blogger in the rationalist community — whose writing on medicine, psychology, AI, and epistemology has shaped a generation of tech and AI thinking.
Creates the rationalist long-form blog as a genre of public intellectual writing — Alexander's essays (often 10,000+ words, combining research review, steelmanning, and original analysis) set the standard for the kind of careful, comprehensive reasoning about contested empirical and policy questions that short-form journalism cannot achieve.
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