Cassidy is excited to return to San Francisco Playhouse, where he previously performed in You Mean to Do Me Harm and in a word. He has also performed in Imaginary Comforts and The Thing About Jellyfish (Berkeley Repertory Theatre), Fallen Angels, Doubt, Distracted, and The 39 Steps (Theatre Works Silicon Valley), and Game On (San Jose Repertory Theatre). Other Bay Area credits include The Great Leap, Ella, The Underpants, and The 39 Steps (Center REP), Bosoms and Neglect and Safe House (Aurora Theatre Company), Don Quixote, The Tempest, and Othello (Marin Shakespeare Company), and The 39 Steps (San Jose Stage Company). Regionally he has performed in multiple plays at both Capital Stage and Pacific Repertory Theater.