What actor in many Coen brothers films also appeared in a film directed by Tim Blake Nelson? 
The Grey Zone: The Grey Zone is a 2001 film directed by Tim Blake Nelson and starring David Arquette, Steve Buscemi, Harvey Keitel, Mira Sorvino, and Daniel Benzali. Steve Buscemi:  He is also known for his appearances in many films by the Coen brothers: "Miller's Crossing", "Barton Fink", "The Hudsucker Proxy", "Fargo", and "The Big Lebowski".
Steve Buscemi