Bill Hauser is the guy who made my all time favorite T shirt design:
He also did the cover art for Catch Your Breath 7" by Our Turn, one of my favorite hardcore bands...
Of course, these are only my personal favorites. Looking generally at his artwork, there is a lot of truly amazing and unique stuff.
Here are some examples of his work, posters, covers, shirts... but be sure to check out the rest of his works on these pages:
Bill Hauser page on Facebook