<P> As with Animaniacs, Steven Spielberg was the executive producer during the entire run, Tom Ruegger was the senior producer, Jean MacCurdy was the executive in charge of production, and Andrea Romano was the voice director . Peter Hastings, Rusty Mills and Liz Holzman produced the show when it was spun off from Animaniacs, as well as the season it ran primetime on the WB . After the first season Hastings left the show and Mills took over as the supervising producer . </P> <P> The original Pinky and the Brain shorts on Animaniacs were written primarily by Peter Hastings . Upon moving into its own show, the writing staff included Gordon Bressack, Charles M. Howell IV, Earl Kress, Wendell Morris, and Tom Sheppard . Comedian Alex Borstein was also a staff writer, years before her fame on MADTV and Family Guy . Classic Warner Bros. cartoon director Norm McCabe also wrote for the show . </P> <P> Pinky and the Brain were voiced by Rob Paulsen and Maurice LaMarche, respectively . The series also used the work of many of the same voice actors for Animaniacs including Tress MacNeille, Jess Harnell, Frank Welker, Nancy Cartwright, Janet Waldo and Jeff Bennett . Celebrities such as Roddy McDowall, Nora Dunn, Townsend Coleman, Ernest Borgnine, Eric Idle, Dick Clark, Ed McMahon, Steve Allen, Joyce Brothers, Gavin MacLeod, John Tesh, Michael McKean, Garry Marshall, Mark Hamill, James Belushi and Steven Spielberg have all performed guest voice work for the series as well . Cree Summer has also voiced characters in Pinky and the Brain and reprised her role as Elmyra during Pinky, Elmyra, and The Brain . </P> <P> As with Animaniacs, Pinky and the Brain was scored by a team of talented composers, led by Emmy - Award winning composer Richard Stone . This team included Steven Bernstein and Julie Bernstein, who also orchestrated and sometimes conducted the 40 - piece orchestra . The recordings were done on Stage A on the Warner Bros lot, the same stage (and with the same piano) where Carl Stalling recorded his Looney Tunes music . The theme music for Pinky and the Brain was composed by Richard Stone with lyrics by Tom Ruegger . </P>

Who does the voice of brain in pinky and the brain