Anne-Emanuelle Birn and Theodore M. Brown bring together a group of professionals and activists whose lives have been dedicated to health internationalism. By presenting a combination of historical accounts and first-hand reflections, this collection of essays aims to draw attention to the longstanding international activities of the American health left and the lessons they brought home. The involvement of these progressive U.S. health professionals is presented against the background of foreign and domestic policy, social movements, and global politics.