Who is Edwin Sneller from The Pelican Brief and what is their importance?

Edwin Sneller is one of Victor Mattiece's lawyers, Sneller coordinates details of illegal activities like Khamel's assassination of Supreme Court justices Rosenberg and Jensen and the murder of Darby Shaw. Sneller is pictured renting hotel rooms adjacent to the killer, providing photographs, maps, itineraries, and arranging for escape vehicles. When Shaw proves cunning and elusive, Mattiece is furious and orders a futile search in New York City. When she is found in Washington, Sneller is understaffed and knows they will not prevent Shaw's talking.