Jenn Mascott
Judge of the United States Court of Appeals for the Third Circuit
Incumbent
Assumed office October 10, 2025
Appointed by	Donald Trump
Preceded by	Kent A. Jordan
Personal details
Born	Jennifer Lee Miller 1976 (age 49–50) Westminster, Maryland, U.S.
Education	University of Maryland, College Park (BS) George Washington University (JD)

Jennifer Lee "Jenn" Mascott^[1] (born 1976) is an American lawyer and jurist serving as a United States circuit judge of the United States Court of Appeals for the Third Circuit. Prior to her judicial appointment, Mascott was a law professor whose research focused on separation of powers and litigation. She taught at the Columbus School of Law of Catholic University of America (2025), the Antonin Scalia Law School of George Mason University (2017–2024), and the George Washington University Law School (2011–2017).^[2]

Mascott was born Jennifer Lee Miller in 1976 in Westminster, Maryland.^[3] She graduated from the University of Maryland, College Park in 1997 with a Bachelor of Science, cum laude, in mathematics and government.^[4] She then spent seven years on the staffs of several U.S. members of Congress. From 1997 to 1999, she was a legislative assistant to Representative John Hostettler of Indiana. From 1999 to 2001, she was deputy press secretary and then systems technology manager for the Senate Republican Conference. She was then press secretary to Representative Eric Cantor of Virginia from 2001 to 2002 and to Representative Anne Northup of Kentucky from 2002 to 2003.^[5][3]

In 2003, Mascott entered the George Washington University Law School, where she was the senior projects editor of the George Washington Law Review. She graduated in 2006 with a Juris Doctor, summa cum laude, having attained the highest cumulative graduating GPA (4.22) in the school's history.^[2]

After law school, Mascott was a law clerk to then-judge Brett Kavanaugh of the U.S. Court of Appeals for the D.C. Circuit from 2006 to 2007 and then to Justice Clarence Thomas of the U.S. Supreme Court from 2008 to 2009. From 2011 to 2017, she was a lecturer at George Washington University Law School and from 2015 to 2017 was an Olin/Searle Fellow at Georgetown University Law Center. From 2017 to 2024, she was an assistant professor of law at the Antonin Scalia Law School of George Mason University. She received the Federalist Society's 2023 Joseph Story Award. From 2017 to 2019, Mascott was also of counsel at the law firm Consovoy McCarthy Park PLLC in Arlington, Virginia.^[3]

During Donald Trump's first term, Mascott served as deputy assistant attorney general in the Office of Legal Counsel from 2019 to 2020 and as associate deputy attorney general in the United States Department of Justice from November 2020 through January 2021. In 2021, Mascott left the Justice Department to work as an assistant professor of law at the Antonin Scalia Law School at George Mason University, where she worked until 2024.^[2] She then worked as a managing trustee at Adfero, a public relations firm, until 2025.^[3]

In 2025, she served in the White House Counsel's Office as senior advisor under Trump. Mascott also served as an associate professor of law at the Columbus School of Law at the Catholic University of America, where she is on public service leave.^[2][3]

On July 16, 2025, President Donald Trump announced his intention to nominate Mascott to a seat on the United States Court of Appeals for the Third Circuit vacated by Kent A. Jordan. On September 3, 2025, she testified before the U.S. Senate Judiciary Committee.^[6] On October 1, 2025, her nomination was reported from the Senate Judiciary Committee by a 12–10 party-line vote.^[7] On October 8, 2025, the United States Senate invoked cloture on her nomination by a 50–47 vote.^[8] On October 9, 2025, her nomination was confirmed by a 50–47 vote, with Republican Senator Lisa Murkowski voting against her confirmation.^[9] She received her judicial commission on October 10, 2025.^[10]

Mascott and her husband, Jeff Mascott, had four children together. Jeff Mascott died of pancreatic cancer in 2023 at age 48.^[11][12]

• Mascott, Jennifer L. (2018). "Who Are 'Officers of the United States'?" (PDF). Stanford Law Review. 70 (3): 443–564.
• — (2018). "Gundy v. United States: Reflections on the Court and the State of the Nondelegation Doctrine". George Mason Law Review. 26 (1): 1–25.
• — (2019). "Early Customs Laws and Delegations" (PDF). George Washington Law Review. 87 (6): 1388–1450.

• List of law clerks of the Supreme Court of the United States (Seat 10)

• Jennifer Mascott at the Biographical Directory of Federal Judges, a publication of the Federal Judicial Center.

Legal offices
Preceded by Kent A. Jordan	Judge of the United States Court of Appeals for the Third Circuit 2025–present	Incumbent