Grant Sullivan (born Jerry Schulz, June 30, 1924 – May 31, 2011) was an American actor who starred as investigator Brett Clark in the television series, Pony Express, which aired in syndication from 1959 to 1960.

[3] He changed his name to Grant Sullivan[3] and appeared on Broadway in Auntie Mame (1956)[4] before he moved to television roles.

His other stage credits included Happy Birthday with Joan Blondell, Portrait Of a Lady with Jennifer Jones, and Tonight Or Never with Ilona Massey.

[1] Prior to Pony Express, Sullivan appeared in such series as The Secret Files of Captain Video, Robert Montgomery Presents, 77 Sunset Strip, and Ray Milland's Markham.

He worked as a business executive for both Mission Viejo Company and Great Western Real Estate until his retirement.