Greg Walker is a producer and writer.
Smallville
Series • 2001
The X-Files
Series • 1993
Without a Trace
Series • 2002
Titans
Series • 2018
Extant
Series • 2014
L.A. Doctors
Series • 1998
Three Rivers
Series • 2009
Vegas
Series • 2012
Harsh Realm
Series • 1999
Gargoyles
Movie • 1972
