If you have ever read a book about American animation history, the odds are that Mark Kausler's name is in the acknowledgments. In fact, if his name isn't there, you probably shouldn't bother to read the book.
Besides being one of the most knowledgeable people on animation's history, Kausler is also an animator himself who has worked on features such as Who Framed Roger Rabbit?, Fantasia 2000 and Osmosis Jones; TV series like Snookums and Meat and his own independent film, It's the Cat (you can view the pencil test here).
The Animation Guild, as part of its continuing series of podcasts, has interviewed Kausler. Here is part one and here's part two.