American actor and singer who played "Johnny Casino" and "Teen Angel" in the original Broadway production of Grease. Also a Grammy-winning singer and songwriter, he co-founded a vocal group called The Manhattan Transfer.
As a young boy, he appeared in the original Broadway production of Oliver!
He released a 2003 solo album entitled Another Place and Time.
He was born in Newark, New Jersey.
He provided the singing voice for Dino Spumoni on Hey Arnold!, an animated series created by Craig Bartlett.