Question: What has the man who voiced George in the 2006 version of "Curious George" been for most of his career?

Context articles: Frank Welker
Curious George Rides a Bike
Curious George Goes to the Hospital
Curious George (TV series)
Curious George Takes a Job
Curious George (book)
Upside Down (Jack Johnson song)
Curious George 2: Follow That Monkey!
Curious George (film)
All the Way to the Ocean

Franklin Wendell Welker (born March 12, 1946) is an American actor, who for most of his career has specialized as a voice actor.
 He is best known for his role as Fred Jones from the "Scooby-Doo" franchise since its conception in 1969, as the only original voice actor still with the "Scooby-Doo" franchise, along with the voice of Megatron in the "Transformers" franchise, specifically "Transformers G1" and "", as well as Scooby-Doo since 2002.
 He is also well known as both the vocal effects and the voice of Nibbler in "Futurama".
Curious George Rides a Bike is a children's book written and illustrated by Margret Rey and H. A. Rey and published by Houghton Mifflin in 1952.
 It is the third book of the original Curious George series and tells the story of George's new bicycle and his experiences performing with an animal show.
Curious George Goes to the Hospital is a children's book written and illustrated by Margret Rey and H. A. Rey and published by Houghton Mifflin in 1966.
 It is the seventh and final book in the original Curious George series, and tells the story of George's experiences in a hospital after swallowing a jigsaw puzzle piece.
 The book was written to ease the way for hospital-bound children.
Curious George is an American animated children's television series based on the children's book series of the same name which features Jeff Bennett as the voice of The Man with the Yellow Hat.
 Frank Welker, who voiced George in the 2006 feature film, returns here as the voice of Curious George.
 As of April 2017, the show is still broadcasting on PBS Kids.
 It debuted in 2006, and began its ninth season on October 28, 2014.
Curious George Takes a Job is a children's book written and illustrated by Margaret Rey and H. A. Rey and published by Houghton Mifflin in 1947.
 It is the second of the Curious George books and tells the story of George taking a job as a window washer.
Curious George is a children's book written and illustrated by Margret Rey and H. A. Rey, and published by Houghton Mifflin in 1941.
 It is the first book in the Curious George series and tells the story of a orphaned monkey called George and his adventures with the Man with the Yellow Hat.
"Upside Down" is a song written, co-produced, and performed by Jack Johnson for the film "Curious George".
 It is the first track and first single from the album "Sing-A-Longs and Lullabies for the Film Curious George", which was released in February 2006.
Curious George 2: Follow That Monkey!
 is a 2009 animated comedy film of the children's stories by H.A. Rey and Margret Rey.
 It is a sequel to the successful 2006 theatrical feature film "Curious George".
 It was originally titled "Curious George 2: Monkey on the Run".
 It was released straight to DVD.
Curious George is a 2006 American German animated adventure comedy film based on the Curious George books by H.A. Rey and Margret Rey.
 It was directed by Matthew O'Callaghan, who replaced Jun Falkenstein.
 Ken Kaufman wrote the screenplay based on a story by him and Mike Werb.
 Ron Howard, David Kirschner, and John Shapiro produced.
 It was released on February 10, 2006 by Universal Pictures.
 It stars Will Ferrell, Drew Barrymore, Dick Van Dyke, David Cross, Eugene Levy, Joan Plowright, and Frank Welker.
 It was Universal's first theatrically-released animated film since 1995's "Balto", and Imagine Entertainment's first fully animated film.
All the Way to the Ocean is a 2016 computer animated short film based on the children's book of the same name by Joel Harper.
 The screenplay was written by Joel Harper, Pete Michels, and Doug Rowell.
 The film was directed by Doug Rowell and produced by Joel Harper.
 The film is narrated by American actress Marcia Cross and features the song With My Own Two Hands by Ben Harper (brother of) Joel Harper.
 This is an alternate version of the original song featuring Jack Johnson and is also featured on the Curious George film soundtrack "Sing-A-Longs and Lullabies for the Film Curious George".
 The lyrics focus on how changes in the world can come about when a single person decides to take action.
 The song's popularity in Europe was such that Ben Harper was awarded French "Rolling Stone Magazine"'s "Artist of the Year" (Artiste De L'Année) in 2003.
 The film also features music by Joel Harper and Burning Spear with their collaboration on the song The Time is Now.
 The film stars voice-overs by actress and activist Amy Smart and Australian musician Xavier Rudd.