Wm. David Cornwell Sr., a prominent litigator in the sports world with a stable of all-star clients, is leaving Gordon Rees Scully Mansukhani for Barnes & Thornburg.

The move comes nearly three years after Gordon Rees absorbed DNK Cornwell, the Atlanta-based firm founded by Cornwell, a former in-house lawyer at the National Football League and general counsel for trading card company Upper Deck.