William J. Leonard

Located in

Philadelphia, PA

Bill has a multi-faceted practice that includes matters such as antitrust litigation, public finance and securities matters, zoning and land use, construction, and insurance litigation, including legal malpractice cases. He represents a diverse client base including real estate owners and developers, insurance companies, legal professionals, school districts, and government entities.

Bill has diverse and comprehensive experience in complex commercial disputes, where he serves as trial and appellate counsel. His breadth of litigation experience allows him to advise clients on a variety of legal fronts, adding value to his representations by enabling him to provide clients with guidance in different areas without having to rely on additional consultation.

Some of his recent representative matters include:

  • Handling anti-trust actions involving price-fixing and monopoly;
  • Advising clients in government fraud and qui tam cases;
  • Representing a Pennsylvania school district in construction litigation;
  • Counseling clients on legal malpractice suits;
  • Assisting insurance companies in collections of delinquent premiums and deductibles; and
  • Representing owners and developers in real estate partnership disputes.

In 18 of the last 20 years, including in 2024, Bill has been named one of “Pennsylvania’s Super Lawyers®,” an honor bestowed on 5% of Pennsylvania lawyers, in both Philadelphia magazine and Thomson Reuters, Legal, “Pennsylvania Super Lawyers.” He has earned an AV ® preeminent rating from Martindale-Hubbell, indicating his preeminent legal ability and very high ethical standards.

Currently, Bill serves on the Board of the Southeastern Pennsylvania Transportation Authority (SEPTA). Previously, he served 12 years as a member of the Board of Directors of the Pennsylvania Intergovernmental Cooperation Authority (PICA) and was the Board’s vice chairman for a number of years. PICA is a Commonwealth-created authority empowered to review and approve budgets and five-year spending plans of the City of Philadelphia. Bill also served, by appointment of the Montgomery County Commissioners, as a member of the Board of Directors of the Montgomery County Development Corporation. He was a member of Governor Tom Wolf’s Revenue Transition Team.

Bill is a member of the firm’s Diversity Committee and is the past chairman of the firm’s Recruiting Committee. He believes in giving back to the community. He is a member of the Whitpain Recreation Association, a community nonprofit, which runs intramural sports programs in the Blue Bell area for thousands of children, ages 7-16.

Awards Won*

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