Born in Indianapolis, he paid his dues as a magician, disc jockey, comedian and studio page in Los Angeles during the 1970s. When Jack Barry's announcer fell sick on The Joker's Wild (1972), 1973, Marc (then a 22-year-old page) filled in. That was his break. He began warming up audiences for network programs like Soap (1977), Star Search (1983) and Alice (1976), gaining exposure that finally led to his "organic" misadventures on Nickelodeon's Double Dare (1986) (which he hosted from 1986 to 1994) and What Would You Do? (1991).