This is a segment of an Archive of American Television interview with long-time writer, Seaman Jacobs. From 10:58-21:50, he talks about writing (with writing partner Fred S. Fox) for Lucille Ball on The Lucy Show and (mainly) Here's Lucy. From 9:11 to 10:58, he also talks about Desi Arnaz and writing for The Mothers-in-Law.

http://www.youtube.com/watch?v=99j_ZInIOUc