Saul Rubinek

Saul Rubinek is a Canadian actor commonly cast in roles as an Ambiguously Jewish friendly father figure, a Rules Lawyer, or The Professor. He actually is Jewish and was born in Nazi Germany, but fled with his parents to Canada, where he later began his film career. His most prominent roles so far have been as Artie Nielsen in Warehouse 13 and Leon's father David in The Trotsky, but he has had minor supporting roles in episodes of Frasier, Law and Order, Curb Your Enthusiasm, Star Trek: The Next Generation, Stargate SG-1, Leverage, and Psych, as well as films like Unforgiven, True Romance and Wall Street. He has also written a play called Terrible Advice that is set to premiere in September of 2011.

Saul Rubinek provides examples of the following tropes:

Badass Bookworm: Not quite as Badass in Real Life, but brilliant in all cases.
Cameo: For being a well known and liked actor, most of his roles are as Bit Characters, although Retroactive Recognition may play a large part in this.
Encyclopaedic Knowledge: See One of Us below.
Everyone Is Christian At Christmas: Was the centre of the Warehouse 13 Christmas Special.
Grandpa What Massive Hotness You Have: He's looking really good for 63^[1] and is actually still quite attractive.
I Have No Son: Has played characters on both sides of this.
Jewish and Nerdy: In Real Life he's One of Us.
Jewish Complaining: In several roles.
Mean Character, Nice Actor: He had a recurring role as a villain in Leverage.
One of Us: As a promo for Warehouse 13 he was quizzed about the show. He not only got all the questions right, but began lecturing his questioner about actual historical technology.
One-Shot Character: Many of his early roles.
The Professor