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Koslo was born at the very end of World War II in what would soon become West Germany, the son of a Prussian soldier. He can still remember American Sherman tanks roling down the street, and waiting for American soldiers to throw out Hershey's Chocolate and Wrigley's bubble gum to the local children. It was in Germany he learned of cowboys and Indians from the GI's, his first real taste of anything related to film.
Koslo emigrated to Regina, Saskatchewan, Canada in the 1950s with his family and soon learned to speak fluent English. No more than a year after he arrived in Canada, Koslo saw his first film, a Tarzan movie. Ever since, he has wanted to be an actor.
His family would later move to British Columbia, where he got a part-time job working for his brother-in-law. He describes himself at the time as being somewhat of a rebel. In high school, he would cheat in track races, and him and his friends would lock series of combination locks together in the locker room. As a teenager, he was drafted by the Canadian Mounties to fight a forest fire, from which he made quite a lot of money. He used the money to hitchhike across North America twice.
Soon after, Koslo auditioned for the National Film School in Montreal and got in, but was kicked out a year later. But as luck would have it, he was asked to do an audition for PBS's Crime and Punishment by an executive who saw him while he was walking through the CBC parking lot. An acting agency took notice, and from there the acting jobs came easy, and he went to California.
Koslo's acting debut was in a little known movie calledFlux by Jack Starrett and Richard Compton. At the time, Koslo was also doing an off-Broadway production of Hair in New York, which ran for four months. His next film was The Losers, followed by The Omega Man and then Vanishing Point.
Koslo has since become one of the most popular supporting actors in both television and film in Hollywood. He began working in television in 1971 with Bearcats! and has also worked in both domestic and foreign film. He built somewhat of a repertoire working in television series produced by Glen A. Larson, having played supporting roles in Galactica 1980, Knight Rider, Quincy, M.E., The Highwayman and Buck Rogers in the 25th Century. He has also worked in Mission Impossible, Gunsmoke, MacGyver and Stargate SG-1.