William J. Sullivan

William Sullivan focuses his practice on complex commercial litigation, including representation of publicly traded corporations in contract disputes, consumer fraud, and class actions. He has experience drafting substantive pleadings and dispositive motions, refining large-scale discovery, and preparing for trial. William also has extensive experience in alternative dispute resolution, including recently representing a large reinsurance company in arbitration as second chair. He presented witnesses and assisted in preparing expert testimony at the hearing.

Prior to joining the Firm, William 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, William enjoys playing pick-up basketball, playing for the Firm's softball team, movies, and enjoying Chicago's food scene.

William earned his B.A. from the University of Iowa, and his J.D. from Loyola University Chicago School of Law, magna cum laude, where he was an Executive Editor of Lead Articles at Loyola University Chicago Law Journal.

William's Practice

Representative Matters

• Represented a large reinsurance company through arbitration hearing as second chair.
• Successfully moved to dismiss a breach of contract and quantum meruit complaint against Fortune 500 food distributor client.
• Protected trucking client’s business by litigating and obtaining all relief requested through temporary restraining order.
• 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.