Special Agent Simon (1 episode, 2015)
CEO David Gorham 1 episode, 2011
New Pilot (1 episode, 2005)
Warren Herman (4 episodes, 2003-2005)
Dr. Bernard Morris (1 episode, 2002)
David Housman (1 episode, 2000)
Dr. Alfredo Salinas / ... (2 episodes, 1992-1994)
Lawrence Ravenscroft 1 episode, 2018