Mark directed all three incarnations of June Moon at the Ohio Theater (Lucille Lortel award, Best revival), the McCarter Theater and Off-Broadway at the Variety Arts. For Portland Stage Company he directed Sight Unseen by Donald Margulies.

His recent acting work includes the role of Einstein in Steve Martin's Picasso at the Lapine Agile (Obie Award, Drama Desk nomination), Morris in As Bees in Honey Drown by Douglas Carter Beane, and Andrei in Three Sisters at the Roundabout.

He has also appeared on such television shows as Spin City and Suddenly Susan.