John Markus
Biography
Filmography
Cast (Special)
Brilliant But Cancelled
(2002)
The Cosby Show: A Look Back
(2002)
Himself
Writer (Special)
Time Warner Presents the Earth Day Special
(1990)
Other Writer
Special Thanks (Special)
Time Warner Presents the Earth Day Special
(1990)
Other Writer
Misc. Crew (Special)
The Cosby Show: A Look Back
(2002)
Other
Life Events
