Gustav Gerson Kahn (November 6, 1886 – October 8, 1941) was a musician, songwriter and lyricist. Kahn was born in Koblenz, Germany in 1886. The family immigrated to the United States and moved to Chicago, Illinois in 1890. After graduating from high school, he worked as a clerk in a mail order business before launching one of the most successful and prolific careers from Tin Pan Alley. Kahn married Grace LeBoy in 1916 and they had two children, Donald and Irene.