---
title: "Jennifer Lee Mascott | KnowJudges"
canonical: "https://knowjudges.com/kyj/judge/jennifer-lee-mascott"
page_type: "judge_profile"
updated: "2026-10-07"
---

# Jennifer Lee Mascott

U.S. Court of Appeals for the Third Circuit · U.S. Circuit Judge

## Profile

- Court: U.S. Court of Appeals for the Third Circuit
- State: National federal courts
- Role: U.S. Circuit Judge
- Service status: active
- Last verified: 2026-07-25

## Summary

Official statewide and applicable court procedural guidance applies to this judge.

## Biography

### Professional career

- Jennifer Lee “Jenn” Mascott is an American judge and lawyer serving on the U.S. Court of Appeals for the Third Circuit since October 10, 2025
- Senior counsel, White House Counsel's Office, 2025
- Associate professor of law, Catholic Law School, 2024-2025; founder and director, Separation of Powers Institute and Student Litigation Clinic, 2024-2025
- Academic roles: Professor at George Mason University’s Antonin Scalia Law School (2017–2024), Catholic University of America’s Columbus School of Law (2024–2025)
- Government service: Deputy and Associate Deputy Attorney General in the U.S. Department of Justice’s Office of Legal Counsel (2019–2021)
- U.S. Department of Justice, 2019-2021; deputy assistant attorney general, Office of Legal Counsel, 2019-2020, 2020-2021; associate deputy attorney general, 2020-2021
- Law clerk, Hon. Clarence Thomas, Supreme Court of the United States, 2008-2009
- She clerked for Justice Clarence Thomas (2008–2009) and Judge Brett Kavanaugh on the D.C. Circuit (2006–2007)
- Law clerk, Hon. Brett M. Kavanaugh, U.S. Court of Appeals for the District of Columbia Circuit, 2006-2007
- White House Counsel’s Office senior counsel in the second Trump administration

### Education


### Additional information

- Nominated by President Donald Trump on July 16, 2025, to replace Kent A. Jordan, and confirmed by the Senate on October 9, 2025.
- Scholarship: Published in Stanford Law Review, Notre Dame Law Review, and Supreme Court Review; recipient of the 2023 Justice Joseph Story Award.
- Private practice, Arlington, Virginia, 2017-2019
- Olin/Searle Fellow, 2016-2017
- Olin/Searle Fellow, Georgetown University Law Center, 2015-2017
- George Washington University Law School, 2011-2013, 2015-2017; professorial lecturer in law, 2011, 2012, 2012-2013, 2015
- Born Jennifer Lee Miller in 1976 in Westminster, Maryland, Mascott obtained a B.S. from the University of Maryland, College Park and a J.D. summa cum laude from George Washington University Law School in 2006.

## Before you appear

- Read the judge-specific standing order first when one is listed.
- Check the docket and case orders for requirements that supersede broader guidance.
- Confirm current remote-access and courtroom technology arrangements before the proceeding.

## Courtroom Rules

### appellate oral argument

Scope: courtwide

In federal courts of appeals, oral argument is allowed unless a three-judge panel unanimously finds one of Rule 34's specified grounds for dispensing with it; the clerk provides the date, time, place, and time allocation.

Evidence excerpt: Oral argument must be allowed in every case unless a panel of three judges who have examined the briefs and record unanimously agrees that oral argument is unnecessary

[Federal Rule of Appellate Procedure 34, Oral Argument](https://www.uscourts.gov/forms-rules/current-rules-practice-procedure/federal-rules-appellate-procedure)
Source checked: 2026-07-26


## Sources

- [Official profile](https://www.fjc.gov/node/13762064)
- [Official roster](https://www.fjc.gov/node/13762064)
- [Federal Judicial Center biography](https://www.fjc.gov/node/13762064)
- [Federal Rule of Appellate Procedure 34, Oral Argument](https://www.uscourts.gov/forms-rules/current-rules-practice-procedure/federal-rules-appellate-procedure)
- [Judge Jennifer Lee Mascott](https://www.fjc.gov/node/13762064)

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