Michael Des Barres, who played Murdoc in MacGyver (1985-1992) plays Nicholas Helman, the current Murdoc's (David Dastmalchian's) teacher in this episode.
Michael Des Barres (the original Murdoc) plays a character named Nicholas Helman. On the original Macgyver, Daniel Davis played a character of the same name who was the head of H.I.T., the organization Murdoc belonged to.