William Jerome Flannery, September 30, 1865 – June 25, 1932) was an American songwriter, born in Cornwall-on-Hudson, New York, of Irish immigrant parents, Mary Donnellan and Patrick Flannery. He collaborated with numerous well-known composers and performers of the era but is best remembered for his decade-long association with Jean Schwartz with whom he created many popular songs and musical shows in the 1900s and early 1910s.

Jean Schwartz was a Hungarian-born Jewish American composer and pianist. He is best known for his work writing the scores for more than 30 Broadway musicals, and for his creation of more than 1,000 popular songs with the lyricist William Jerome. Schwartz and Jerome also performed together on the vaudeville stage in the United States; sometimes in collaboration with Maude Nugent, Jerome's wife, and the Dolly Sisters. Schwartz was married to Jenny Dolly from 1913 to 1921.