William J. Kassab

William J. Kassab is an Associate at Parkowski, Guerke & Swayze, P.A. in Wilmington, Delaware. Kassab focuses on administrative and governmental law, environmental law, regulatory enforcement, commercial law, and civil litigation. The practice includes regulatory counseling, agency proceedings, environmental enforcement, legislative matters, and litigation involving state and federal regulatory programs. The work calls for close attention to the record, governing law, procedure, and the practical choices available to the client.

Kassab earned a J.D. from Widener University Delaware Law School in 2013 and a B.S. in Natural Resources Management and Policy from Paul Smith’s College in 2008. His academic background aligns closely with a practice centered on environmental regulation and public-agency decision making. The training supports Kassab’s ability to evaluate legal questions, organize detailed facts, and explain options in environmental and administrative law matters. It also provides useful context for the practical issues clients may face.

Kassab’s experience includes nine years as a Deputy Attorney General in the Delaware Attorney General’s Office, primarily representing the Department of Natural Resources and Environmental Control, followed by service as an attorney-advisor to the U.S. Environmental Protection Agency Region III. The work has required detailed preparation, procedural judgment, and coordination with the people and institutions involved in each matter. That experience helps place legal and evidentiary questions in the practical setting in which clients must make decisions.

William J. Kassab has represented government agencies in the Delaware Supreme Court, federal appellate and trial courts, Delaware Superior Court and Court of Chancery, and before administrative bodies. He joined Parkowski, Guerke & Swayze in 2025 and is admitted in Delaware, Pennsylvania, and New Jersey. This professional record complements Kassab’s work in environmental and administrative law and related matters. The combination of subject-matter experience, preparation, and communication helps clients understand the legal framework and the practical considerations affecting their next steps.

Law Office Affiliations

• Attorney, Parkowski, Guerke & Swayze, P.A.
• Member, Delaware State Bar Association
• Member, Pennsylvania Bar Association
• Member, New Jersey State Bar Association

Licensed State

• Delaware
• Pennsylvania
• New Jersey

Education

• Widener University Delaware Law School
  Juris Doctor (JD)
• Paul Smith’s College
  Bachelor of Science (BS) in Natural Resources Management and Policy

Awards & Badges