Writers credited with episodes in the fourteenth season included J. Stewart Burns, Kevin Curran, John Frink & Don Payne, Dana Gould, Dan Greaney, Brian Kelley, Tim Long, Ian Maxtone-Graham, Carolyn Omine, Mike Scully, Matt Selman, John Swartzwelder, Matt Warburton and Marc Wilmore. Freelance writers included Brian Pollack & Mert Rich, Sam O'Neal & Neal Boushall, Dennis Snee and Allen Glazier. Animation directors included Bob Anderson, Mike B. Anderson, Chris Clements, Mark Kirkland, Lance Kramer, Nancy Kruse, Lauren MacMullan, Pete Michels, Steven Dean Moore, Matthew Nastuk, Michael Polcino, Jim Reardon and David Silverman. The main cast consisted of Dan Castellaneta (Homer Simpson, Grampa Simpson, Krusty the Clown, among others), Julie Kavner (Marge Simpson), Nancy Cartwright (Bart Simpson, Ralph Wiggum, Nelson Muntz), Yeardley Smith (Lisa Simpson), Hank Azaria (Moe Szyslak, Apu, Chief Wiggum, among others) and Harry Shearer (Ned Flanders, Mr. Burns, Principal Skinner, among others). Other cast members included Marcia Wallace (Edna Krabappel), Pamela Hayden (Milhouse Van Houten, among others), Tress MacNeille (Agnes Skinner, among others), Russi Taylor (Martin Prince) and Karl Wiedergott (Additional Voices). This season also saw the return of voice actress Maggie Roswell (Helen Lovejoy, Maude Flanders, among others), who had left the show during season 11 because of a contract dispute.