Damn, that's an impressive portfolio. He accomplished a lot in his life and he was a part of several amazing projects. At least people will be watching the characters he helped bring to life for years to come.

He definitely has left his mark and left his heritage/works for us to enjoy.
I first learned about him by M*A*S*H. He played a major role in the later seasons.

Oddly, one of the parts I remember his most for was the narrator in Mickey's Once Upon A Christmas.

I watched all of my cartoons during my childhood with german overdubs. I wasn't remotely aware that he had such a massive presence in these productions. I learned that just eventually from that video.
The only toonish voiceover I knew from him was King Hugh in the adventure game Toonstruck, which I first played a few year ago.
I loved his acting in M*A*S*H though, as I mentioned before.

He made a real fine narrator, indeed.