He has composed opera and musical theater, chamber music, orchestral music and song cycles that have been performed in the United State and Europe and broadcast on "The American Century" on WQXR-FM in New York City.

He is the author of "Maestros of the Pen: A History of Classical Music Criticism in America."  A second book entitled "The Rise and Fall of the Broadway Musical: How an American Icon was Lost"  was published in 2004.

Mark has guest lectured at the Eastman School and the Juilliard School on piano history and Percy Grainger, and has been a consultant to a PBS documentary on the Van Cliburn piano competition.