Maryland physician.

Practiced in Prince George’s County, Marylandd. Moved to Philadelphia (1748). Published A Discourse on the Preparation of the Body for the Smallpox: and the Manner of receiving the Infection (Philadelphia: B. Franklin and D. Hall, 1750), in which he advocated preparing the patient with debilitating drugs and a mild milk and vegetable diet. Thomson’s therapeutic principles, and still more his strictures against unqualified practitioners, sparked a stormy medical debate. Active member of the St. Andrew’s Society in both Philadelphia and New York.

Born in Scotland. Educated at Edinburgh (M.D.) Married Lettice (Lee) Wardrop; two daughters.