Here are some links to articles and pages dedicated to Stephen Gammell. I do not own, nor am I the author of any of these original articles/ videos. All rights belong to those who uploaded/ created them.
BOOK TRAILER TO MUDKIN: THE MAKING OF MUDKIN: (YouTube)
https://www.youtube.com/watch?v=8DsMn274gKQ
Children's Literature Network: They did a pretty nice profile on Gammell. Here's the link!-
http://www.childrensliteraturenetwork.org/aifolder/aipages/ai_g/gammell.php
A blog post:
http://alafastanzioart.blogspot.com/2010/08/artist-220-stephen-gammell.html
Another blog post, titled "Childhood Influence"
http://danielyagminjr.blogspot.com/2009/12/childhood-influence-stephen-gammell.html