Jan Tříska
Tříska also played the assassin in Miloš Forman's The People vs. Larry Flynt, and appeared in Highlander: The Series (season 5, episode 10), Highlander: The Raven, Blizzard, The Osterman Weekend, Ronin, Apt Pupil (as Isaac Weiskopf), and Peter Hyams' 2010: The Year We Make Contact.