Mark Jacoby is currently starring in the Broadway Revival of Sweeney Todd. Previously, he portrayed the Padre in the Broadway revival of Man of La Mancha. Mark originated the role of Father in the Broadway production of Ragtime, a portrayal called "perfection” by the New Your Post's Clive Barnes. He earned Tony, Outer Critics' and Joseph Jefferson Award nominations for his performance as Gaylord Ravenal in Showboat, directed by Harold Prince, and he is a Theatre World Award recipient for his Broadway debut as Vittorio Vidal in Sweet Charity, directed by Bob Fosse.

For two and-a-half years Mark played the title role in The Phantom of the Opera on Broadway, a role he had created to critical acclaim in the American National tour. Mr. Jacoby received a 2001 Drama Desk nomination for his performance Off-Broadway as the Playwright in Enter the Guardsman, a performance heralded by The New York Times as "Just right in every way." He also appeared as Baron von Gaigern in Grand Hotel on Broadway, Oscar Jaffee in the Goodspeed Opera revival of On The Twentieth Century (Connecticut Drama Critics' Award: Best Actor in a Musical), Guido Contini in the Chicago premiere of Nine (Joseph Jefferson Award: Best Actor in a musical), Robert in Robert and Elisabeth (the inaugural production of the Paper Mill Playhouse), and John Jasper in the First National Tour of The Mystery of Edwin Drood.

Television audiences have seen and heard Mark on such broadcasts as Larry King Weekend, Smithsonian Salutes Disney for the Disney Channel, Sondheim: A Celebration at Carnegie Hall (PBS) and Hammerstein the 100th Anniversary (PBS). He as appeared as a soloist with The New York Philharmonic, the Detroit, Dallas, San Diego, Portland and Vancouver Symphony Orchestras, the Greg Smith Singers, The Norman Luboff Choir, and can be heard on a variety of recordings, including cast recordings of his Broadway shows.