John Viener is a writer, story editor and voice artist for Family Guy. He was a Co-Executive Producer for The Cleveland Show.
He wrote the episodes "The Perfect Castaway", "Untitled Griffin Family History", "Movin' Out (Brian's Song)", "The Man with Two Brians", "Jerome Is the New Black", "April in Quahog" and "Tiegs for Two".
He co-wrote Family Guy Presents: Seth & Alex's Almost Live Comedy Show, which he also was the announcer for.
He voiced the sex-changed Meg Griffin, known as Ron Griffin, in the third Stewie Griffin: The Untold Story segment "Stu & Stewie's Excellent Adventure". He even once voiced a version of Peter Griffin that was completely sober in the episode "Friends of Peter G".
He has also voiced many other characters on the show, including Derek Wilcox, New Brian, Sean Connery, Adolf Hitler, Fjurg Van Der Ploeg, Millie the Jamaican Maid, Apache Chief, Chief Oleki, Matthew Fox, Robert Loggia, an agent from the FCC, and Harrison Ford.