Grant Sullivan (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.The Fremont, Nebraska-born Jerry Schulz was reared in Southern California, where he attended schools in both Long Beach and Anaheim. Sullivan served in the United States Navy during World War II.