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In page Billy Crystal:

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Crystal returned to New York City. For four years, he was part of a comedy trio with two friends. They played colleges and coffee houses and Crystal worked as a substitute teacher on Long Island.[1] Crystal later became a solo act and performed regularly at The Improv and Catch a Rising Star. In 1976, he appeared on The Tonight Show Starring Johnny Carson and on an episode of All in the Family. Crystal was on the dais for the Dean Martin celebrity roast of Muhammad Ali on February 19, 1976, where he performed impressions of both Ali and sportscaster Howard Cosell. This began a lifelong friendship between Ali and Crystal.[citation needed]