The fourth inducted Disney Legend was Ub Iwerks. Mr. Iwerks had been with Walt since his Kansas City days, well before he even dreamed of heading out to California. Ub was one of Walt's most trusted friends who had a hand in creating Oswald and Mickey Mouse.
Ub eventually wanted to head out on his own and had Walt and Roy buy out his shares of the Disney Studios. His non-Disney career never took off and Ub re-joined Disney in the 1950's, working on special effects.