Cameo of Thomas Reid by James Tassie, Hunterian Museum, Glasgow Thomas Reid (; 7 May (O.S. 26 April) 1710 – 7 October 1796) was a religiously trained Scottish philosopher best known for his philosophical method, his theory of perception, and its wide implications on epistemology, and as the developer and defender of an agent-causal theory of free will. He also focused extensively on ethics, theory of action, language and philosophy of mind. Wikipedia