In The Simpsons, Principal Seymour Skinner's mother is Agnes Skinner and the Professor's name is Jonh Frink. See full cast and crew here.
The Simpsons is the longest-running scripted show in television history; it first aired on December 17, 1989. Giving voice to the Simpsons and other Springfield citizens are Dan Castellaneta, Julie Kavner, Nancy Cartwright, Yeardley Smith, Harry Shearer, and Hank Azaria. Find out more about the series here.
Of interest, “The Simpsons” paid tribute to the late Marcia Wallace in its final episode for Edna Krabappel, Bart's teacher and Springfield’s long-standing elementary school teacher. Wallace voiced the character in more than 100 episodes of the show. Catch more at Variety