Preacher Jack was the stage name of John Lincoln Coughlin (born February 12, 1942), who is an American pianist. Coughlin taught himself piano growing up in Malden, Massachusetts, and became an underground success playing in Boston in the 1960s and 1970s. George Thorogood heard him play and had him signed to Rounder Records, for whom he would record two albums in the 1980s. He took an extended break from recording in the 1990s and continued touring, finally releasing new material, including another album on Rounder, late in the decade.