- (May 1998) Played in "All in the Timing" anthology of one-act plays by David Ives (Geffen Playhouse, Hartford, Connecticut, USA)
- Appeared in "Chicago" in the replacement cast directly after the one starring Bebe Neuwirth and Ann Reinking. McGowan replaced Joel Grey as Amos Hart.
- (May 2002) Plays Adam Badeau in "A Few Stout Individuals" play by John Guare (Signature Theater Company, New York City, New York, USA).
- (June 2009) Playing the Wizard in the National Touring Company of Wicked
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