Best known for producing and co-writing songs for The Four Seasons, many of which were Top 10 hits.
He attended New York City's Parsons School of Design. He was influenced by Stan Kenton, Harry James, Duke Ellington, Tommy Dorsey, and Benny Goodman growing up.
He was inducted into the Songwriters Hall of Fame in 1985.
His former sister-in-law was Cindy Bullens.
He collaborated with Roberta Flack, Bobby Darin, Michael Jackson, and Patti LaBelle.