Alex Trebek

George Alexander "Alex" Trebek (/trɨˈbɛk/; born July 22, 1940) is a Canadian-American television personality. He has been the host of the syndicated game show ' since 1984; before that, he hosted other game shows, including ', ', and '. Trebek has made appearances in numerous television series, usually portraying himself.

On Arthur
He portrayed a version of himself named Alex Lebeck in the season 5 episode "Arthur and the Big Riddle". The character appeared again in "Elwood City Turns 100!", though the character did not talk.

Trivia

 * He, like a lot of the actors in the series, is Canadian.
 * He also appeared in an episode of "Magic School Bus" and possibly "Sesame Street", which were both fellow PBS shows.  His "Sesame Street" appearance may be the second time a real-life game show host appeared on the show (the other being Richard Dawson).