Stephen Silver is a character designer who has created characters for top animation studios like Warner Brothers, Disney (Kim Possible) and Nickelodeon (Danny Phantom). He also teaches at Schoolism, CalArts and Los Angeles Academy of Figurative Arts.
The Art of Silver is his personal sketchbook filled character sketches, a few caricatures and figure drawings, as well as some work he did for various animation studios. He uses a variety of medium including pens, colour pencils, markers, charcoal, etc. The myriad style and versatility is amazing, as it's the asset of a good character designer. Be it the rough sketches or smooth lines, all his characters have character and looks fun.
Throughout the pages, he also shares a few tips on drawing and creating characters, including how he manages to create so many different styles. There's even a short but inspiring autobiography on how he started out.
Note that the third edition of the book sports a white cover, with an additional 16 bonus pages. I'm not sure if Amazon's actually selling the third edition. If not, you can get it at Stephen Silver's online store.
Character designers should find this book an interesting reference.
There are more pictures of the book on my blog. Just visit my Amazon profile for the link.