Brown's first Broadway credit was The Girl in the Freudian Slip opened in 1967. It starred Alan Young and Marjorie Lord. He contributed to New Faces of 1968. He also wrote the book for the off-Broadway musical How to Steal an Election which starred Clifton Davis. Brown also had sketches appear in several Julius Monk nightclub revues. On the nightclub circuit, he worked on material for Joan Rivers, Georgie Kaye, David Frost and others.
In television, he wrote material for over 100 television shows including That Was the Week That Was, The Jackie Gleason Show, Love American Style, and several Max Liebman specials.
In 1975, The Wiz opened and he began work on another Broadway musical. This time, he worked with Charles Strouse and Lee Adams (who wrote Annie). Their show, A Broadway Musical, opened and closed on the same night in 1978.
Brown has written several books of humor and frequently contributes articles to magazines. He had a syndicated comic strip Mixed Singles in 1975.