Scott Alexander (born 1984) is a pseudonymous American psychiatrist and blogger. Alexander is the author of the blogs Slate Star Codex (SSC) and its successor Astral Codex Ten (ACX), and a contributor—originally under the user name Yvain—to the community blog LessWrong.


Alexander studied philosophy as an undergraduate, and in 2012 graduated from University College Cork School of Medicine, Ireland. He did his residency at St. Mary Mercy Hospital in Michigan, United States. He specializes in treatment-resistant depression and his areas of interest within psychiatry include chronotherapy, behavioral genetics, and the ontology of psychiatric disorders. One of Alexander's blog posts[1] was subsequently revised and published in Pharmacology Research & Perspectives.[2]

Before establishing his own practice, Lorien Psychiatry, Alexander worked at LifeStance Health (formerly Pacific Coast Psychiatric Associates) and served as Senior Health Researcher of MetaMed, a medical consulting company.[3][4][5] Since 2021, Alexander has been on the advisor board of the Qualia Research Institute....

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