Barry E. Carter, a professor at Georgetown University law school whose specialties included international law, died Jan. 15 at his home in Washington. He was 71.

The cause was cancer, said his wife, Kathleen Ambrose.

Mr. Carter also was a former deputy undersecretary of the Commerce Department for export administration. In that job, he administered and enforced trade and nonproliferation laws.

At Georgetown, he was director of the Center on Transnational Business and the Law.

Barry Edward Carter was born in Los Angeles. He graduated from Stanford University in 1964, received a master’s degree in 1966 from Princeton University’s Woodrow Wilson School of Public and International Affairs, and graduated from Yale Law School in 1969.

He was an Army officer, a Pentagon program analyst and a member of Henry Kissinger’s National Security Council staff before joining the Georgetown law faculty in 1979.

He took a leave of absence to serve at the Commerce Department during the Clinton administration, then returned to Georgetown. He gave his last lecture there in November.

Mr. Carter wrote two books on international law.

He was a member of the Council on Foreign Relations and the St. Albans Tennis Club.

Survivors include his wife of 27 years, Kathleen Ambrose of Washington; two children, Gregory A. Carter of New Orleans and Meghan E. Carter of Mission, Tex.; and a brother.

— Bart Barnes