There is no biography for John Markus yet.
Show · 1984
Show · 1978
Show · 1992
Show · 2018
Show · 2001
1992
Writer · 90 episodes
1984
Writer · 197 episodes
1982
Teleplay
1978
Writer
2018
as Self · 2 episodes
Producer · 90 episodes
Producer · 197 episodes
2001
Creator
1998
