This is a thorough yet easy-to-read biography of one of the major figures in Presbyterian and ecumenical church history. During the course of his forty-six-year career as Secretary of the Board of Foreign Missions of the Presbyterian Church (U.S.A.), Robert Speer shaped church policy, increased Presbyterian funding of world missions, and influenced many church leaders, including John D. Rockefeller Jr., Henry Sloane Coffin, and John Mackay. Pastors, laity, professors, and students interested in the history of mission work and ecumenical relations will be interested in the life and accomplishments of this influential Presbyterian.