Catherine M.A. Carroll


  • Vice Chair, Appellate and Supreme Court Litigation Practice

Catherine Carroll is a nationally recognized appellate litigator with more than 15 years of experience briefing and arguing cases on a wide range of issues in the US Supreme Court and the federal courts of appeals, representing clients in district court litigation, and counseling clients on matters raising complex legal questions. She has argued four cases and briefed dozens more before the US Supreme Court and argued numerous cases in federal appellate courts across the country.

Ms. Carroll serves as vice chair of WilmerHale’s Appellate and Supreme Court Litigation Practice.

Ms. Carroll's practice spans a wide variety of statutory, regulatory and constitutional issues. Her recent matters have involved such diverse areas as data privacy, the Administrative Procedure Act, ERISA, insurance and reinsurance, antitrust law, First Amendment law, and criminal law and procedure. In addition, she frequently represents clients on a pro bono basis in cases raising significant issues of constitutional law and capital habeas procedure.

In recent years, Ms. Carroll has been recognized as a nationwide leader in appellate advocacy by Chambers USA, Best Lawyers in America, Legal 500 United States, and other legal publications. 

Before joining the firm, Ms. Carroll served as a law clerk to Associate Justice David H. Souter of the US Supreme Court. Previously, she clerked for The Honorable Harry T. Edwards of the US Court of Appeals for the District of Columbia Circuit.

Professional Activities

Ms. Carroll serves as Chair of the Standing Committee on Amicus Curiae Briefs of the American Bar Association and is a member of the Edward Coke Appellate Inn of Court.


  • Selected to the 2024 Washington DC Super Lawyers list for her appellate practice.
  • Recognized by Best Lawyers in America® in 2020–2023 for her appellate practice.
  • Recognized in the 2020–2024 editions of Chambers USA Guide as a nationwide leader in the Appellate Law category.
  • Recommended in the 2017 and 2018 editions of The Legal 500 United States for her appellate practice.
  • Named an Appellate Rising Star by Law360 in 2016 and 2014.
  • Named to the Lawdragon 500 Leading Litigators in America list.

Insights & News


  • Education

    • JD, University of Michigan Law School, 2002

      magna cum laude Order of the Coif, Michigan Law Review, Campbell Moot Court winner
    • BA, Government, College of William and Mary, 1998

      summa cum laude Phi Beta Kappa
  • Admissions

    • District of Columbia

    • Virginia

  • Clerkships

    • The Hon. Harry T. Edwards, US Court of Appeals for the District of Columbia Circuit, 2003 - 2004

    • The Hon. David H. Souter, US Supreme Court, 2004 - 2005



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