[1] He made his Broadway debut in 1905 portraying the conniving politician Pat McCann in the Jean Schwartz and William Jerome musical Fritz in Tammany Hall.
[2] He portrayed another politician, Sam Grady, in Joseph E. Howard's 1906 Broadway musical The District Leader at Wallack's Theatre.
[3] He returned to Broadway in 1912 as Sarsfield O'Brien in The Girl from Brighton at the Academy of Music.
[4] Hart served a term as vice president of The Lambs.
He also served as an officer of the Actors' Equity Association and was a member of the White Rats of America.