Benjamin Thompson, soldier, philanthropist, and physicist, born at Woburn, Massachusetts; a fortunate marriage lifted him into affluence, relieving him from the necessity of teaching; fought on the British side during the American War; became a lieutenant-colonel, and for important services was knighted in 1782 on his return to England; entered the Bavarian service, and carried through a series of remarkable reforms, such as the suppression of mendicity, the amelioration of the poorer classes by the spread of useful knowledge, culinary, agricultural, &c.; was made a Count of the Holy Roman Empire, and placed in charge of the War Department of Bavaria; was a generous patron of science in England and elsewhere; retired from the Bavarian service in 1799, and five years later married the widow of Lavoisier the chemist; his later years were spent in retirement in a village near Paris, where he devoted himself to physical research, especially as regards heat (1753-1814).