 From 1925 until his death, he contributed to the libretti of many Broadway musicals.He wrote the book for most of the Rodgers and Hart musicals of the 1930s and later collaborated with his sister Dorothy on several musicals, including "Annie Get Your Gun", "Something for the Boys", "Up in Central Park", and "Arms and the Girl".He won the 1959 Tony Award for Best Musical for "Redhead".