During his 35-year career, Bill Cosby has gone from nightclub comic to international personality and America’s most beloved humorist. It was while he was working in nightclubs during college that his natural sense of humour prompted friends to suggest that he create a comedy routine. Bolstered by an enthusiastic response, by 1962 he was performing at New York's Gaslight Cafe in Greenwich Village. The next year, he was invited to perform on "The Tonight Show." Cosby has become a television staple ever since…