William Leinen


With experience at both the federal and state court levels, Bill provides practical solutions to resolve a wide range of litigation matters in the best interest of his clients. He has successfully resolved matters at all phases of litigation, including through motions, trial, and appellate practice. Bill’s practice primarily involves representing institutional defendants and their employees in complex commercial, employment, product liability, intellectual property, and tort cases. In commercial and employment matters, Bill handles claims arising from breach of contract, business torts, employee benefits, ERISA, insurer bad faith, and fraud. Bill has also defended numerous clients in a variety of tort claims, including grave injury and wrongful death, and in intellectual property disputes, including copyright and trademark infringement matters. Bill is also experienced in alternative dispute resolution, including successfully mediating favorable and early resolutions for his clients.

In addition, Bill advises and represents health care providers in regulatory and compliance-related matters, including potential False Claims Act, Stark Law, Civil Monetary Penalties Law, and Anti-Kickback violations, and assists health care providers with public and private reimbursement issues.

Outside of work, Bill enjoys trying to keep up with his two young kids.

Representative Experience

  • Obtaining a $1 million verdict, plus approximately $700,000 in prejudgment interest, in a bench trial against an insurance company for its bad faith in the adjustment of a claim (see Quincy Mut. Fire Ins. Co. v. New York Cent. Mut. Fire Ins. Co., 89 F. Supp. 3d (N.D.N.Y. 2014)).
  • Obtaining summary judgment dismissing a grave injury personal injury case against a third-party defendant employer (see Roberts v. Los Alamos Nat'l Sec., LLC, 278 F. Supp. 3d 651 (W.D.N.Y. 2017)).
  • Obtaining affirmance at the Second Circuit Court of Appeals of summary judgment granted to former employees regarding entitlement to benefits under ERISA plan (see Gill v. Bausch & Lomb Supplemental Ret. Income Plan I, 594 F. App'x 696 (2d Cir. 2014)).
  • Obtaining summary judgment in favor of a utility company and its employee dismissing claims by landowner of alleged violation of property and easement rights (N.Y. Supreme Court, Dutchess County 2016).
  • Trial of pro bono § 1983 prisoner rights case to verdict in 2017 (W.D.N.Y. 2017).
  • Obtaining summary judgment on contract claim for attorney’s fees in employee retention plan (N.Y. Supreme Court, Monroe County 2017).



  • The College of William & Mary School of Law, J.D., 2011
    – Notes Editor, William & Mary Law Review
  • Colgate University, B.A., 2006

Admissions to Practice

  • New York
  • U.S. Court of Appeals, Second Circuit
  • U.S. District Courts of New York (Western, Northern)


  • New York State Bar Association
  • Monroe County Bar Association

Presentations & PUBLICATIONS

  • "Preserving Republican Governance: An Essential Government Functions Exception to Direct Democratic Measures." 52 Wm. & Mary L. Rev. 997, 2010.


  • Selected to New York Super Lawyers® Rising Stars, 2017