townspeople. Azaria, who has been a part of the main voice cast since the second season in one episode "Old Money" and then perpetually part of the regular main voice cast since the third season, voices recurring characters such as Moe Szyslak, Chief Wiggum, Apu Nahasapeemapetilon and Professor Frink. Shearer provides voices for Mr. Burns, Mr. Smithers, Principal Skinner, Ned Flanders, Reverend Lovejoy and formerly Dr. Hibbert. Every main cast member has won a Primetime Emmy Award for Outstanding Voice-Over Performance. With one exception, episode credits list only the voice actors, and not the characters they voice. Both Fox and the production crew wanted to keep their identities secret during the early seasons and, therefore, closed most of the recording sessions while refusing to publish photos of the recording artists. However, the network eventually revealed which roles each actor performed in the episode "Old Money", because the producers said the voice actors should receive credit for their work. In 2003, the cast appeared in an episode of Inside the Actors Studio, doing live performances of their characters' voices. The six main actors were paid $30,000 per episode until 1998, when they were involved in a pay dispute with Fox. The company threatened to replace them with new actors, even going as far as preparing for casting of new voices, but series creator Groening supported the actors in their action. The issue was soon resolved and, from 1998 to 2004, they were paid $125,000 per episode. The show's revenue continued to rise through syndication and DVD sales, and in April 2004 the main cast stopped appearing for script readings, demanding they be paid $360,000 per episode. The strike was resolved a month later and their salaries were increased to something between $250,000 and $360,000 per episode. In 2008, production for the twentieth season was put on hold due to new contract negotiations with the voice actors, who wanted a "healthy bump" in salary to an amount close to $500,000 per episode. The negotiations were soon completed, and the actors' salary was raised to $400,000 per episode. Three years later, with Fox threatening to cancel the series unless production costs were cut, the cast members accepted a 30 percent pay cut, down to just over $300,000 per episode. In addition to the main cast, Pamela Hayden, Tress MacNeille, Marcia Wallace, Maggie Roswell, and Russi Taylor voice supporting characters. From 1999 to 2002,