Question: Perry the Platypus has had his only vocal characteristic provided by which American voice actor?

Context articles: Perry the Platypus
Neil Ross
Dee Bradley Baker
Arrin Skelley
Paul Eiding
Rodger Parsons
Johnny Murray (voice actor)
Jon St. John
Phineas and Ferb
Mick Wingert

Perry the Platypus, also known as Agent P or simply Perry, is an anthropomorphic platypus from the American animated series "Phineas and Ferb."
 Perry was created by the series' co-founders, Dan Povenmire and Jeff "Swampy" Marsh.
 He first appeared along with the majority of the main cast in the pilot episode "Rollercoaster."
 Perry is featured as the star of the B-plot for every episode of the series, alongside his nemesis Dr. Heinz Doofenshmirtz.
 A mostly silent character, his lone vocal characteristic (a rattling of Perry's beak) was provided by Dee Bradley Baker.
Neil Ross (born 31 December 1944) is an English-born American voice actor and announcer, now resident in the United States, working in Los Angeles.
 Noted for his Trans-Atlantic accent, Ross has provided voices in many American cartoons, most notably "Voltron", "G.I. Joe" and "Transformers".
 He has also done voice work in numerous video games, including "Mass Effect" and and .
 Ross has also provided voice roles (such as radio announcers) for many movies, including "Back to the Future Part II", "Babe", "Quiz Show", and "Being John Malkovich".
Dee Bradley Baker (born August 31, 1962) is an American voice actor.
 His major roles, many of which feature his vocalizations of animals, include animated series such as "American Dad!
", "", "Gravity Falls", "Phineas and Ferb", "", "Star Wars Rebels", "Ben 10", and "The 7D", live-action series such as "Legends of the Hidden Temple" and "Shop 'til You Drop", films such as "The Boxtrolls" and "Space Jam" and video games such as "Halo", "Gears of War", "Viewtiful Joe", and "Spore".
Arrin Skelley is an American voice actor.
 He is best known for being the voice actor of Charlie Brown in three prime time television specials: – "You're the Greatest, Charlie Brown", "It's Your First Kiss, Charlie Brown", and "She's a Good Skate, Charlie Brown".
 Skelley also was a voice actor of Charlie Brown in "Bon Voyage, Charlie Brown (and Don't Come Back!!)
", an animated film from 1980.
 Skelley also provided the voice for newly recorded soundtracks featured on "Charlie Brown Records" released in 1978.
Paul Eiding (born March 28, 1957) is an American voice actor, voice instructor, and actor, perhaps best known as the voice actor behind Perceptor in the original Transformers cartoon, Colonel Roy Campbell in the "Metal Gear" series, the narrator in "Diablo", Judicator Aldaris in "StarCraft", and Max Tennyson in "Ben 10", "", "", and "Ben 10 Omniverse" where he also did the vocal effects for Zed, Liam and voices for several other characters.
 He is also the Vault Tec Rep from "Fallout 4".
Rodger Parsons is an American voice actor who has appeared in various films and is known in New York voice over circles as a versatile vocal character performer.
 He continues to enjoy a successful career as a writer (both rewrite and polish as well as original scripts) and voice person and has narrated many documentaries, does extensive corporate work and has many radio and TV commercials to his credit.
 He teaches voice-over technique and has a home studio that allows him to send his work anywhere in the world.
 "Putting truth and character in voice makes the difference between just talking and creating vocal roles that seize attention and fascinate the listener."
 (From the Introduction to Rodger Parsons' Voice Over course)
Johnny Murray was an American voice actor.
 Before 1929, he was a cornetist at the Cocoanut Grove.
 In 1929, he was under a contract with First National Pictures to sing for Richard Barthelmess in his films; he provided Barthelmess's voice in "Weary River".
 He is most famous today for his role as Bosko, the first star of Warner Brothers cartoons.
 He was the voice actor for Bosko in the 1933 short, "Bosko's Picture Show".
 This cartoon is infamous for perhaps containing the first cartoon depiction of Adolf Hitler, and possibly of being among the first, if not first, widely distributed films that contain verbal usage of the f-bomb.
 If that is the case, Murray is the first person to use the f-bomb in Hollywood cinema.
Jon St. John (born December 19, 1960 in Merced, California) is an American voice actor and singer.
 He started his career in voice work in 1975, when he was a Top 40 radio DJ in North Carolina.
 Because of his vocal talent and technical skills, he was hired as a production director for several US radio stations in cities including: Norfolk, New Orleans, Philadelphia, Phoenix, San Diego, and Los Angeles.
 St. John was also a radio personality for many years most recently on K-EARTH 101 in Los Angeles.
 He has since provided the voice for numerous video game characters, most notably Duke Nukem.
 On May 4, 2014 he was the host for the 5th anniversary of the PWA:UK (Plymouth Wrestling Alliance).
Phineas and Ferb is an American animated musical comedy television series.
 Originally broadcast as a one-episode preview on August 17, 2007 and again previewed on September 28, 2007, the series officially premiered on February 1, 2008 on Disney Channel, and follows Phineas Flynn and his British stepbrother Ferb Fletcher on summer vacation.
 Every day, the boys embark on some grand new project, which annoys their controlling sister, Candace, who frequently tries to reveal their shenanigans to her and Phineas' mother, Linda Flynn-Fletcher, and less frequently to Ferb's father, Lawrence Fletcher.
 The series follows a standard plot system; running gags occur every episode, and the b-plot almost always features Phineas and Ferb's pet platypus Perry the Platypus working as a spy ("Agent P") for OWCA (the Organization Without a Cool Acronym), to defeat the latest scheme of Dr. Heinz Doofenshmirtz, a mad scientist driven largely by a need to assert his evilness.
 Sometimes, other villains scoff at his level of evil.
 The two plots intersect at the end to erase all traces of the boys' project just before Candace can show it to their mother.
 This usually leaves Candace very frustrated.
Mick Wingert (born July 4, 1974) is an American voice actor, comedian and voice-over coach.
 He is known for his voice over work in video games, movies and TV shows, as well as the new voice of Master Po and Zeng in "", taking over the roles from actors Jack Black and Dan Fogler.
 Wingert has been praised by fans of the "Kung Fu Panda" franchise for his Po voice impression sounding exactly like Jack Black's voice.
 He also does additional voice over work in "Kung Fu Panda", "Mass Effect 2", "", "The Technomancer" and "The Princess and the Frog".
 He is not related to fellow voice actor Wally Wingert.