John Godfrey Knauff (January 5, 1879 – September 1, 1959), known professionally as Jack Norworth, was an American songwriter, singer and vaudeville performer.

Broadway historian John Kenrick credits Edward Madden and Gus Edwards, while the family of Follies songwriter Dave Stamper claims he wrote the song while working as the pianist for Nora Bayes, the officially credited co-writer with Norworth.

Following a few years at sea, he landed in New York City at age 20 to embark on a show business career.

He also appeared April, 13, 1958 on the Ed Sullivan Show to sing "Take Me Out to the Ball Game" along with four players (Ford, Berra, Mantle, Skowron) from the New York Yankees.

[5] On July 11, 2010, a 3-foot-tall (0.91 m) black granite monument, paid for by concerned fans, was installed about 100 feet from Jack's actual headstone.