Warren H. Reynolds, a State Department historian for 30 years, died Jan. 19 at Suburban Hospital in Bethesda. He was 90 and lived in Washington.

The cause was complications from pneumonia, said his son Stephen L. Reynolds.

Dr. Reynolds retired from the State Department in 1986. As a historian, he specialized in foreign affairs, including the United States and Vietnam, and international treaties related to Antarctica, including the establishment of facilities there for scientific purposes.

Warren Harding Reynolds was born in Poughkeepsie, N.Y. He served in the Army during World War II and participated in combat operations in France and Germany.

In 1948, he graduated from Trinity College in Hartford, Conn. From Fordham University in New York, he received a master’s degree in European history in 1950 and a doctorate in history in 1959.

He was a schoolteacher in Connecticut and New York and a Pentagon intelligence officer before joining the State Department.

He was a former vestryman at St. Alban’s Episcopal Church in Washington. He sang in the choir at St. Columba’s Episcopal Church in Washington and at Washington National Cathedral.

His marriage to Helen Mizwa Reynolds ended in divorce. Survivors include two sons, Warren K. Reynolds of Portland, Maine, and Stephen L. Reynolds of Germantown, N.Y.

— Bart Barnes