who the voice of peter griffin?
Seth MacFarlane
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 Seth MacFarlane voices three of the show 's main characters : Peter Griffin , Brian Griffin , and Stewie Griffin . Since MacFarlane had a strong vision for these characters , he chose to voice them himself , believing it would be easier than for someone else to attempt it . MacFarlane drew inspiration for the voice of Peter from a security guard he overheard talking while attending the Rhode Island School of Design . Stewie 's voice was based on the voice of English actor Rex Harrison , especially his performance in the 1964 musical drama film My Fair Lady . MacFarlane uses his regular speaking voice when playing Brian . MacFarlane also provides the voices for various other recurring and one @-@ time @-@ only characters , most prominently those of the Griffins ' neighbor Glenn Quagmire , news anchor Tom Tucker , and Lois ' father , Carter Pewterschmidt . 

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 MacFarlane was cast as four of the show 's main characters : Peter Griffin , Brian Griffin , Stewie Griffin , and Glenn Quagmire . MacFarlane chose to voice these characters himself , believing it would be easier to portray the voices he already envisioned than for someone else to attempt it . MacFarlane drew inspiration for the voice of Peter from a security guard he overheard talking while attending the Rhode Island School of Design . Stewie 's voice was based on the voice of English actor Rex Harrison , especially his performance in the 1964 musical My Fair Lady . MacFarlane uses his regular speaking voice when playing Brian . The voice of Quagmire was inspired by fast @-@ speaking radio advertising spokesmen from the 1950s . MacFarlane also provides voices for various other recurring and one @-@ time characters , including news anchor Tom Tucker and Lois ' father Carter Pewterschmidt . 

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 David Shaughnessy as the voice of Sir Didymus , a brave fox knight . 

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 Seth Green primarily voices Chris Griffin and Neil Goldman . Green stated that he did an impression of the character Buffalo Bill from the thriller film The Silence of the Lambs during his audition . 

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 The producers originally asked Anthony Hopkins and Clint Eastwood to provide the voice of the dentist , Dr. Wolfe , but they both turned the role down . Anthony Perkins was later asked to fulfill the role and he agreed , but died before the role could be recorded . In the end , the role went to Simpsons regular Hank Azaria . As well , the original panelist on Smartline was supposed to be O. J. Simpson , but he turned it down , much to the relief of the writers when Simpson was later tried for murder . 
