Lyricist known for Santa Claus is Coming To Town, You Go to My Head, and That Lucky Old Sun. He worked mainly on Tin Pan Alley.
He was a journalist for many newspapers, including The New York Times, prior to making it big in the music industry.
He was inducted into the Songwriters Hall of Fame in 1972.
He was the son of Anna and William Gillespie.
He collaborated with Peter DeRose.