Zack Giallongo is an illustrator and comics artist. His graphic novel Broxo is full of adventure, and his original comic Ewoks: Shadow of Endor is a must-read for Star Wars fans. He's also done an issue of Adventure Time and illustrated the comic version of Ian Lender's The Stratford Zoo Midnight Review does MacBeth.
Here's a sampling of some of his sketches.
Here's a cute "live action" trailer for his first Broxo comic.
See more of Zack's awesome art on his webpage.