James Thacher (1754–1844) was an American physician and writer, born in Barnstable, Mass. From 1775 to 1783 he was a surgeon in the Revolution, in the Massachusetts 16th Regiment.[1] Afterward, he practiced in Plymouth, Mass. until his death.
Thacher was stationed at West Point in 1780 and supported the execution by George Washington of the British spy John André. He was the author of Military Journal during the American Revolutionary War (1823); Observations Relative to the Execution of Major John André as a Spy in 1780 (1834); American New Dispensatory (1810; fourth edition, 1821); and other books.