Thomas J. Hirschfeld, 82, a retired State Department Foreign Service officer who was an authority on arms control and troop reductions, died Dec. 9 at his home in Alexandria. His wife, Hana Hirschfeld, said he had renal cancer.

Mr. Hirschfeld joined the Foreign Service in 1956 and had early postings in Sweden and Cambodia. In 1970, he was appointed to the U.S. Arms Control and Disarmament Agency and took part in international talks between the United States and the Soviet Union on troop reductions in Europe.

He became deputy assistant director of the agency in 1977 and participated in negotiations between NATO and Warsaw Pact countries about troop reductions.

Mr. Hirschfeld retired from the State Department in 1982 and later held positions as a guest scholar or visiting professor at various institutions, including the Woodrow Wilson Center, Rockefeller Foundation and University of Texas. He was a senior analyst at the Rand Corp. in Santa Monica, Calif., from 1988 to 1992.

From 1992 until his retirement in 2006, he was a senior analyst at the Center for Naval Analyses in Alexandria. He was the author of a book, “Intelligence and Arms Control: A Marriage of Convenience.”

Thomas Johannes Hirschfeld was born in Mannheim, Germany, and came with his family to the United States at age 6. He grew up in New York City and New Rochelle, N.Y.

He received a bachelor’s degree in history from the University of Pennsylvania in 1953, then served two years in the Marine Corps, mostly in Korea.

He received a master’s degree in international relations from Columbia University in 1956.

Mr. Hirschfeld was on the board of United Community Ministries, a community social service agency in southern Fairfax County.

Survivors include his wife of 59 years, Hana Dubsky Hirschfeld of Alexandria; three children, Peter J. Hirschfeld of Gainesville, Fla., Laura E.H. Zeller of Denver and Karin E. Hirschfeld of Seattle; and six grandchildren.

— Matt Schudel