A couple years ago, Gahan Wilson had an official web site (i.e.,
gahanwilson.com). That site is not currently active, but a copy of it
is stored at the Internet Wayback Machine (archive.org):
One of the pages indicates:
"How to contact us...
www.gahanwilson.com is the official site for American cartoonist Gahan Wilson.
e-mail us (firstname.lastname@example.org)."
Another page lists the same email address:
Gahan Wilson has drawn cartoon art for countless advertising campaigns
for magazines, major corporations, record companies, and motion
To contact Gahan Wilson regarding advertising, please e mail us:
A whois search for the GahanWilson.com domain indicates:
P.O. Box 46578
Los Angeles, CA 90046
The same contact information is listed for Mr Winters' company, Canyon Press.
It also appears that Mr Winters has served as producer for some of
Gahan Wilson's projects.
I hope this helps. If anything is unclear, please let me know via the
"request clarification" feature. Thanks.