- Clerk for Judge Walter Stapleton, U.S. Court of Appeals for the Third Circuit (1990-91) and Judge Alex Kozinski, U.S. Court of Appeals for the Ninth Circuit (1991-92)
- Attorney in the Office of the Solicitor General (1992-93)
- Clerk for Justice Anthony Kennedy of the United States Supreme Court (1993-94).
- Associate Counsel in the Office of Independent Counsel (1994-97, 1998).
- Partner at Kirkland & Ellis (1997-98, 1999-2001).
- Associate Counsel and then Senior Associate Counsel to the President (2001-03).
- Assistant to the President and Staff Secretary to the President (2003-06).
- Has argued cases before the Supreme Court of the United States and other appellate courts.
- Has taught full-term courses on Separation of Powers at Harvard Law School (each year from 2008 to 2015), on the Supreme Court at Harvard Law School (2014, 2016, 2017, 2018), on National Security and Foreign Relations Law at Yale Law School (2011), and on Constitutional Interpretation at Georgetown University Law Center (2007).
- Has published articles in the Yale Law Journal, the Georgetown Law Journal, the Harvard Law Review, the Notre Dame Law Review, the Minnesota Law Review, the Catholic University Law Review, the Marquette Lawyer, the Wall Street Journal, the Washington Post, and Lawfare, among other publications.
- Born in Washington, D.C. 1965 (53 years old)
- Married to wife Ashley since 2004
- Father of two daughters
- Captain of high school basketball team; volunteers as youth girls basketball coach; ran Boston marathon in 1990, 2010, 2015.
- Actively involved in community volunteer activities; serves as a regular lector at his parish
- Serves on the United States Court of Appeals for the D.C. Circuit (2006-present)
- Confirmed by the United States Senate in a 57-36 vote
- Samuel Williston Lecturer on Law, Harvard Law School (since 2009)
- Member, Committee on the Judicial Branch of the Judicial Conference of the United States
- Member, Advisory Committee on Appellate Rules of the Judicial Conference of the United States
- B.A., Yale College, 1987; cum laude.
- J.D., Yale Law School, 1990; Notes editor, Yale Law Journal.