From the TCDS page:
Richard was recently diagnosed with Parkinson's disease. With Richard's support, TCDS has asked cartoonists across the country to draw his characters so the artwork can be compiled into a fundraising book and the artwork auctioned to raise additional money. Hundreds of cartoonists have responded and sent artwork in to be compiled in a book soon to be published by Andrews McMeel. We've received cartoons from many of Richard's personal friends including Stephen Pastis (Pearls Before Swine), Sergio Aragones (Mad, Groo), Patrick McDonnell (Mutts), Pat Oliphant (Pulitzer Prize political cartoonist), Dave Kellet (Sheldon, Drive), Gene Weingarten and David Clark (Barney & Clyde), Mason Mastroianni (B.C.), Roger Langridge (Muppet Show comic book, Marvel's Thor: The Mighty Avenger, Fred the Clown), Shannon Gallant (G.I.Joe), Michael Cavna (Washington Post), Steven Artley (Artleytoons), Barbara Dale and Steve Conley (Astounding Space Thrills, Bloop) and even Bill Watterson of Calvin and Hobbes fame. That's just the list of people we asked first because they know Richard. Many other fantastic cartoonists contributed, space doesn't permit us to list them all, but we appreciate everyone's contributions.
If you love the oboe or know someone who does, my original art and contribution to the book is available here.