William J. Sullivan


[email protected]

Phone: (312) 360-6998

Fax: (312) 360-6520



Bill Sullivan is a member of the Litigation Practice Group. He focuses his practice on complex commercial litigation, including representation of publicly traded corporations in contract disputes, consumer fraud, and class actions. Bill has experience drafting substantive pleadings and dispositive motions, refining large-scale discovery, and preparing for trial.

Prior to joining Freeborn, Bill served as an Associate at Wilson Elser LLP, where he focused on defending professional liability claims against accountants, attorneys, contractors, realtors, and other clients holding professional licenses. Additionally, he previously served as a Judicial Extern for Hon. Mary Anne Mason (Ret.) of the Illinois Appellate Court.

Outside of work, Bill enjoys playing pick-up basketball, playing for the Freeborn softball team, cinema, and enjoying Chicago’s food scene.

Representative Matters

Representative Matters

  • Represented a national piping manufacturing company against competitor’s claims of commercial disparagement under the Lanham Act and successfully dismissed the federal claims against it.

  • Successfully argued a motion to dismiss a legal malpractice claim based on a lack of cognizable damages.

  • Drafted a successful motion to allow amendment to a complaint after summary judgment was entered, based on the Loyola factors, which allowed the client to reach a favorable settlement.