Richard G. Johnson, 90, a retired political officer with the U.S. Foreign Service who specialized in Eastern European affairs, died Nov. 19 at his home in Potomac.

He had congestive heart failure, according to his daughter, Susan R. Johnson, a career Foreign Service officer and current president of the American Foreign Service Association.

Mr. Johnson entered the Foreign Service in 1947 and later served as deputy chief of mission — the No. 2 position — at the U.S. embassies in Sofia, Bulgaria, and in Stockholm. He also was deputy chief of the U.S. mission to NATO in Brussels.

One of his last assignments was as deputy director of the Office of East European and Yugoslav Affairs in Washington. After retiring in 1980, he spent 20 years working part time on declassification matters for the State Department.

Richard Garon Johnson was a native of New Haven, Conn. During World War II, he served in Army counterintelligence in Europe. He was a 1946 graduate of Yale University, and he received a master’s degree in 1947 from the Johns Hopkins School of Advanced International Studies.

Mr. Johnson received a State Department Superior Honor Award for work in Algiers when Algeria secured its independence in the early 1960s.

Survivors include his wife of 64 years, Adaline Rockwell “Lynn” Johnson of Potomac; two children, Susan R. Johnson of Washington and retired Foreign Service officer Richard G. Johnson Jr. of Geneva; a brother; and three grandchildren.

— Adam Bernstein