Clark has performed and/or recorded with many of the best artists in blues and roots music, including Billy Boy Arnold, Lurrie Bell, Dickey Betts, Nappy Brown, Sean Costello, Ani DiFranco, Anson Funderburgh, Steve Guyger, Big Joe & The Dynaflows, Bob Margolin, Tom Maxwell, Will McFarlane, Big Bill Morganfield, Danny Joe Reagan, and Junior Watson, at venues around the world.

On the 2014 album Tom Maxwell & The Minor Drag, Clark is featured on this Tom Maxwell & Ani DiFranco duet.

On Long Time Coming, the BMA-nominated album of R&B legend Napoleon "Nappy" Brown, Clark joins blues legends Junior Watson, Bob Margolin, Big Joe Maher, and the late Sean Costello.

On Muddy Waters' son Big Bill Morganfield's Living Blues radio charts #1 album Blues with a Mood, and Born Lover, Clark plays piano and B-3 organ.

Clark plays the piano on Matt Hill's On The Floor, winner of the 2011 Blues Music Award for Best New Artist Debut.