Jim Fletcher (1930-2004) started at Disney as an inbetweener in 1954, straight out of the Art Institute of Chicago. He was laid off in the 1958 shakeup, a few months after being promoted to animator, and spent a few years animating at UPA, Snowball, Eagle and Format ...
... before going back to do comic book work at Disney, working on Scrooge, Mickey Mouse and Mad Madam Mim (some of his work can be seen here).
He spent the late 'sixties and 'seventies bouncing between Filmation and Hanna-Barbera as a background and layout artist; by the time of Larry Eikleberry's 1979 portrait he was supervising layout at Filmation.
The 1980s saw him doing comics work for Eternity Comics and Archie Comics, while once again reinventing himself as a storyboard artist for H-B, Marvel (on Transformers and GI Joe), Hyperion and Disney TV. (Reinvention is the name of the game in the 'toon industry, especially if you want to keep working.)
Jim passed away in 2004.