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Gregory was discovered on the musical theater stage and returns there now and again. Never saw snow until he was 19 years old. While working as a doorman at a nightclub, he met Jason Robards who offered him encouragement to become an actor. He quit his job and moved to L.A. immediately afterward. Gregory served two years as a medic in the Army. In 1980, he formed with Franklin R. Levy the "Catalina Production Group Ltd." producing numerous stage projects, more than two dozen televsion movies. Catalina was an important force in the Los Angeles theater scene, from 1981 to 1992, plays presented by Catalina were honored with over 150 theater awards, E.g. in 1982 for "The Hasty Heart". He is also one of the original members of the Surfrider Foundation, a non-profit environmental organization that works to protect the coast that was founded in 1984. Harrison is an avid surfer. He claims to have ridden the waves of every surfable ocean on almost every continent in the world. He also enjoys swimming, kayaking and is a keen golfer. Has 3 daughters and an adopted son. Wife Randi Oakes is also an actress who played the character "Officer Bonnie Clark" on the TV series CHiPs.