Dewan has worked with They Might Be Giants, Sesame Street, Flaming Fire, Jed Davis, The Music Tapes, Loser's Lounge, The Shondes and The Musical Stones of Skiddaw. He is a member of the Raymond Scott Orchestrette, a group dedicated to reinterpreting Scott's compositions, and appeared on their 2002 album "Pushbutton Parfait". He also composes and performs with the Patient Island Singers, a project loosely centered around the topic of Roosevelt Island. He was an original member of the Blue Man Group "Tubes" house band, for whom he composed musical scores. He later sued the group for authorship claims, and eventually prevailed in court.