John Sparey has this to say about Bob McCrea:
Bob McCrea became a "reanimator". Turned a laughing, time-keeping Snow White into Maid Marian for Robin Hood. Converted Amos from "Ben And Me," trying to hold Ben's kite together, into a character in The Black Cauldron trying to keep a bamboo structure from collapsing.
Bob spent forty years at the House of Mouse, starting with Snow White in 1937 through The Rescuers in 1977. Afterwards he was an animation instructor at CalArts from 1977 until 1986, the last four years as the head of the School of Character Animation. He passed away in 1995.