- (7/01-10/01) Stage: Appeared (as "Leo Herman") in "A Thousand Clowns" on Broadway. Also in cast: Tom Selleck.
- (10/04-1/05) Stage: Appeared (as "Juror #1") in Reginald Rose's "12 Angry Men" in the Roundabout Theatre Company on Broadway.
- (3/06) Stage: Appeared (as "Smith") in "The Music Teacher" play/opera by Wallace Shawn and Allen Shawn at The New Group at the Minetta Lane Theatre, New York City.
- (2/09) Stage: Appeared (as "Brig. Gen. Ezra Mannon) in "Mourning Becomes Electra" by [nm0642156. Theater Row/Acorn, New York City.
- (1977) Stage: Appeared in "The Merchant" on Broadway. Written by Arnold Wesker. Directed by [Dexter]. Plymouth Theatre: 16 Nov 1977-20 Nov 1977 (6 performances + 8 previews). Cast: John Clements (as "Antonio Querini, A mernm0223307chant of Venice"), Joseph Leon (as "Shylock Kolner, A Jew of Venice"), Roberta Maxwell (as "Portia Contarini, An heiress of Venice"), Marian Seldes (as "Rivka Kolner, Shylock's sister"), Russ Banham (as "Venetian"), Mark Blum (as "Venetian") [Broadway debut], Philip Carroll (as "Venetian"), James David Cromar (as "Venetian"), Julie Garfield (as "Jessica Kolner, Shylock's daughter"), Gloria Gifford (as "Nerissa, Portia's maid"), Jeffrey Horowitz (as "Solomon Usque, A playwright"; Broadway debut), Leib Lensky (as "Moses of Castelazzo, a portrait painter"), Rebecca Malka (as "Servant"), Everett McGill (as "Lorenzo Pisani, Bassanio's friend"), Brian Meister (as "Venetian"), Riggs O'Hara (as "Graziano Sanudo, Antonio's assistant"), William Roerick (as "Girolamo Priuli, Doge of Venice"), John Seitz (as "Tubal di Ponti, Shylock's partner"), Nicolas Surovy (as "Bassanio Visconti, Antonio's godson"), Boris Tumarin (as "Abtalion da Modena, Shylock's Tutot") [Final Broadway role], John Tyrrell (as "Venetian"), Angela Wood (as "Rebecca da Mendes, Daughter of Portugese banker"). Produced by The Shubert Organization (Gerald Schoenfeld: Chairman. Bernard B. Jacobs: President), The John F. Kennedy Center for the Performing Arts, Roger Berlind and Eddie Kulukundis. Produced in association with SRO Productions, Ltd. NOTE: During its pre-Broadway tryout in Philadelphia, Zero Mostel played Shylock at the Forrest Theatre in Philadelphia for one preview (2 Sep 1977). He died suddenly on 8 Sep 1977 and was replaced by Joseph Leon.
- (1991) Stage: Appeared in "Lost in Yonkers" on Broadway. Comedy. Written by Neil Simon. Directed by Gene Saks. Richard Rodgers Theatre: 21 Feb 1991-3 Jan 1993 (780 performances + 11 previews that began on 12 Feb 1991). Cast: Mercedes Ruehl (as "Bella"), Kevin Spacey (as "Louie"), Irene Worth (as "Grandma Kurnitz"), Mark Blum (as "Eddie"), Danny Gerard (as "Arty"), Lauren Klein (as "Gert"), Jamie Marsh (as "Jay"). Standbys: Leslie Ayvazian (as "Gert"), Irene Dailey (as "Grandma Kurnitz"), Mike Damus (as "Arty"), David Neipris (as "Jay"). Understudies: David Chandler (as "Eddie/Louie"), Didi Conn (as "Bella/Gert"), Pauline Flanagan (as "Grandma Kurnitz"), David Neipris (as "Jay)", Justin Strock (as "Arty"). Produced by Emanuel Azenberg. Note: Filmed as Lost in Yonkers (1993).
- (2011) Stage: Appeared in Christopher Shinn's "Picked".
- Stage: Appeared in Gore Vidal's "The Best Man" on Broadway.
- (1989) Stage: Appeared in Albert Innaurato's "Gus and Al" at Playwrights Horizons off-Broadway. NOTE: He won an Obie Award for his performance.
- (April 10, 2009 - May 17, 2009) "The Singing Forest," written by Craig Lucas, directed by Mark Wing-Davey, original music composed by John Gromada, and assistant direction by Scott Illingworth; with Olympia Dukakis (portraying Loë Rieman), Mark Blum (portraying Dr. Oliver Pfaff / Martin Rieman), Rob Campbell (portraying Shar Unger / Max Schur), Rob Campbell (portraying Jules Ahmad / Simon Hirsch), Pierre Epstein (portraying Bill / Sigmund Freud), Jonathan Groff (portraying Gray Korankyi / Walter Rieman), Randy Harrison (portraying Laszlo Fickles / Gerhardt Zeitzler), Deborah Offner (portraying Bertha Ahmad / Anna Freud), and Susan Pourfar (portraying Beth Adler / Young Loë) in A Public Theatre production; artistic director - Oskar Eustis, associate producer - Jenny Gersten, and associate artistic director - Mandy Hackett; produced and performed Off-Broadway at the Joseph Papp Public Theater/Martinson Theater, Manhattan, New York City, New York, USA.
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