(2012 to 2013 season) Mac's play, "The Lily's Revenge," was performed at the American Repertory Theatre in Cambridge, Massachusetts. Shira Milkowsky was director. Diane Paulus was artistic director.
(May 24, 2015) Mac acted in Susan Stroman's play, "The Last Two People on Earth: An Apocalyptic Vaudeville," at the American Repertory Theatre in Cambridge, Massachusetts with Mandy Patinkin in the cast. Diane Paulus was artistic director.