Joseph Warren combined medical practice with leadership in Boston's resistance to British authority. A Harvard graduate, he established himself as a physician while developing close connections with Samuel Adams and other Patriot organizers. His political writing, public speeches, and committee work helped turn local disputes over taxation and government into coordinated opposition throughout Massachusetts.

Warren delivered commemorative addresses on the Boston Massacre and played a central role in drafting the Suffolk Resolves in 1774. The resolves rejected coercive measures imposed by Parliament, encouraged economic resistance, and urged preparation for defense. Their endorsement by the First Continental Congress gave a Massachusetts declaration wider political authority. As president of the Massachusetts Provincial Congress and a member of its Committee of Safety, Warren helped organize the alternative government and military preparations emerging outside royal control.

On April 18, 1775, intelligence about British military movements led him to send Paul Revere and William Dawes toward Lexington. Their warnings formed part of a larger alarm network that mobilized the countryside before the fighting at Lexington and Concord. Warren subsequently took part in the day's events and continued working within the provincial leadership as Massachusetts forces gathered around Boston.

Commissioned a major general shortly before the Battle of Bunker Hill, he joined the fighting on June 17 as a volunteer rather than assuming overall command. He was killed when British troops overran the American position on Breed's Hill. The loss deprived the revolutionary movement of a political organizer at the beginning of the war. His remains were later identified with the help of dental work associated with Revere. Later paintings made his death an emblem of sacrifice; they are not literal battlefield records. His career combined provincial administration with armed mobilization.