Claire A. Grega

Philadelphia, PA
Pronouns: She/Her

Claire A. Grega is a member of the Environmental Law Practice group and specializes in complex environmental litigation matters and regulatory enforcement actions.  Ms. Grega concentrates her practice in pursuing and defending complex environmental litigation matters with focus on contribution and cost recovery claims, corporate successor liability, diminution in property value, underground storage tanks, natural resource damages, and soil and groundwater contamination.

Ms. Grega comes to the firm with litigation and regulatory advisory experience from her time practicing in Tennessee. She represents clients in all phases of litigation in both state and federal courts as well as administrative tribunals.   Ms. Grega assists and advises clients on permitting and regulatory matters and litigates claims involving Comprehensive Environmental Resource Recovery and Liability Act (CERCLA), the New Jersey Spill Act, Toxic Substances Control Act (TSCA), emerging matters associated with per-and polyfluroalkyl substances (PFAS)  and other federal and state environmental matters.


Prior to joining Langsam Stevens Silver & Hollaender LLP, Ms. Grega worked at firms in Tennessee and Washington, D.C. Claire concentrated her practice in the areas of litigation, government relations and investigations, and regulatory compliance.  She focused her work on a variety of enforcement matters including subpoenas and other investigations by the FBI, OSHA, FDA, and the Tennessee Department of Commerce and Insurance.  Her regulatory practice encompassed work on drone regulation with the FAA, FDIC compliance, and healthcare compliance and enforcement.

Before she began practicing law, Claire worked in all three branches of the federal government.  She worked as an Analyst in the White House Office of Presidential Correspondence in the Obama administration.  Thereafter, she worked as a Systems Administrator and Legislative Correspondent for U.S. Senator Sherrod Brown. During law school, Claire spent a summer working with The Honorable Judge Donald C. Nugent in the Northern District of Ohio, in her hometown of Cleveland, Ohio.


  • Buchholz Fellow, Committee of Seventy
  • Associate Member, Delaware Valley Environmental American Inn of Court


  • Board Member, East Coast Greenway Alliance


  • District of Columbia
  • New Jersey
  • Pennsylvania
  • Tennessee


  • Juris Doctor, Case Western Reserve University School of Law
  • Bachelor of Arts, magna cum laude, John Carroll University