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After leaving Walt Disney Productions at the start of the 60s, Don worked for Walter Lantz and then Hanna-Barbera. And at H-B he found a long-term professional home, and remained there for thirty-plus years. ...
I asked him whether he preferred Disney or Hanna-Barbera; he told me that he had a much happier time at Joe and Bill's place, because he was better respected and made to feel like "one of the family."
Though he worked on some iconic features at Disney, Don felt he was underpaid and not particularly appreciated. And as he relates, Walt held grudges against many of the employees who went out during the 1941 strike ...which likely explains why Don's post-war Disney career never took off.
As Mr. Lusk says, he was "relieved" when finally let go, and the relief turned out to be well-founded: he had decades of productive work still ahead of him.