Mr. McCarthy assists clients with a wide array of issues in federal district and appellate courts across the country. He frequently represents clients in complex litigation involving diverse legal issues arising under the First Amendment, the Equal Protection Clause, the Commerce Clause, and other provisions of the U.S. Constitution. Mr. McCarthy also represents clients in litigation matters involving numerous federal statutes such as the Administrative Procedure Act, the Federal Arbitration Act, the Sherman Act, the Communications Act, the Voting Rights Act, and the Patent Act. He also represents clients with regulatory matters before the Federal Communications Commission, the Federal Trade Commission, and various other federal agencies.

Mr. McCarthy is a former law clerk to Judge David B. Sentelle of the United States Court of Appeals for the D.C. Circuit, and Judge Frank W. Bullock, Jr. of the United States District Court for the Middle District of North Carolina. Since 2011, McCarthy has been the co-director of the George Mason University School of Law (GMUSL) Supreme Court Clinic. He previously taught an advanced constitutional law seminar at GMUSL.

Mr. McCarthy earned his B.S. from the University of Notre Dame, where he was a Notre Dame Scholar, and his J.D. magna cum laude from George Mason University School of Law. Mr. McCarthy is a member of the Virginia and District of Columbia bars.