- Along with Jeffrey Combs, he is one of only two actors to play two different, completely unrelated characters in a single episode of a "Star Trek" series, playing Lt. Peter Durst and Sulan in the Star Trek: Voyager (1995) episode "Faces.".
- Graduated from New York's American Academy of Dramatic Arts in 1983, along with (among many others) actors Elias Koteas, Illeana Douglas, Louis Mustillo, Adam Klugman, Jody Wood, Elisa Anders, Jonathan Mandell, and Michael Reid Carter. After graduating, Markinson, Koteas, Wood, Anders, Mandell, and Carter were members of the Academy of Dramatic Arts' 1983-1984 Production Company.
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