Gregory George Katsas (born August 6, 1964) is an American lawyer and jurist serving as a United States circuit judge of the United States Court of Appeals for the District of Columbia Circuit. He was appointed in 2017 by President Donald Trump. Before his appointment to the bench, Katsas served as Deputy White House Counsel in the first Trump administration, as an assistant attorney general in the United States Department of Justice, and as a partner at the law firm Jones Day.

Gregory George Katsas
District of Columbia Circuit Court of Appeals
Born 1964 in Boston, MA
FJC ID: 4022736
Career output and lasting influence
Opinions attributed per year · peak 10/year
Later decisions citing those opinions, per year · peak 22/year
District of Columbia Circuit Court of Appeals · 2017–
Both charts share the same year axis. Opinion counts include only opinions in our corpus attributed to this judge so far — a year at zero can mean an attribution gap, not judicial silence. Influence typically outlasts the career: citations keep climbing after the last opinion.
- Gender
- Male
- Race
- White
Prior employment
- Private practice, Washington, D.C.1992–2001, 2009–2017
- Deputy assistant and deputy counsel to President Donald J. Trump2017
U.S. Department of Justice2001–2009- ↳deputy assistant attorney general, Civil Division · 2001–2006
- ↳principal deputy associate attorney general · 2006–2008
- ↳acting associate attorney general · 2007–2008
- ↳assistant attorney general, Civil Division · 2008–2009
Law clerk , Hon. Clarence Thomas · 1991–1992
Law clerk , Hon. Clarence Thomas · 1990–1991
Law clerk , Hon. Edward R. Becker · 1989–1990
Appointments
2017–present · Appointed by Donald J. Trump (Republican)
Education
J.D. · 1989- Princeton UniversityA.B. · 1986