His story of how he got the job is really charming.
Per the Brony documentary, DeLancie's granddaughters were fans of the show, and his wife verbally accepted the job for him before even telling him about it.
I met him once at the Star Trek Ireland group's talk. I have a photo of us with him holding the resin horga'hn that I bought at a little charity auction they held. Nice dude. Hates Trump.
In a 2012 interview, he said that he recalled his original audition, after which Roddenberry approached him, touched him on the shoulder, and said, "You make my writing sound better than it is."