Mandy Patinkin Dr. Jeffrey Geiger Actor Adam Arkin Dr. Aaron Shutt Actor Christine Lahti Dr. Kathryn Austin Actor Thomas Gibson Actor Vondie Curtis-Hall Dr. Dennis Hancock Actor Roxanne Hart Actor Peter MacNicol Actor Peter Berg Dr. Billy Kronk Actor Jayne Brook Dr. Diane Grad Actor Héctor Elizondo Dr. Phillip Watters Actor Liz Vassey Guest Star Jon Gries Guest Star Thomas F. Duffy Guest Star Neil Giuntoli Guest Star Kimberly Scott Guest Star Karen Malina White Guest Star Rip Torn Guest Star Brooke Langton Guest Star John Tinker Executive Producer Michael Dinner Executive Producer