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.