- (1973) Stage: Appeared (Broadway debut) in "Irene" on Broadway. Also in cast: Debbie Reynolds. Show ran for 200 performances. NOTE: Markham won a Theatre World Award for his performance.
- Same Time, Next Year(1975). Comedy.
- (1961) He played Hotspur in William Shakespeare's play, "Henry IV Part One," at the Oregon Shakespeare Festival in Ashland, Oregon with Angus Bowmer (Falstaff); Ed Brubaker (Bardolph); Eugene Peyroux (Hal); Rod Alexander (The King) and Nagle Jackson (Westmoreland) in the cast. Angus Bowmer was also producing director. Richard Risso was director.
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