Marshall Efron (born February 3, 1938) is an American actor and humorist originally known for his work on the listener-sponsored Pacifica radio stations WBAI New York and KPFK Los Angeles, and later for the PBS television show The Great American Dream Machine (the original showcase of Chevy Chase). At WBAI, Efron was a frequent guest on Steve Post's & Bob Fass's shows, along with left-wing/counter-culture figures such as Paul Krassner.