Without this guy we wouldn't have Justified, which is one of my absolute favorite television shows on right now. Not to mention awesome movies like Get Shorty, Out of Sight, Jackie Brown, 3:10 to Yuma (I'm looking at his IMDB page, and I had no idea this was based on a short story he had written!) and another awesome television, the short lived Karen Sisco. I also found the movies The Big Bounce, Be Cool and Kill Shot to be quite underrated. Especially The Big Bounce was light, breezy fun.
Incredible writer. His influence will continue to be felt, I'm sure.