Peter D. Whitney, 68, a Foreign Service officer who specialized in international economics, died Feb. 9 at Virginia Hospital Center in Arlington County.

He had complications from a series of strokes, said his wife, Martha Whitney.

Mr. Whitney joined the State Department in 1967. He served as an economist and was an expert on South American affairs. He held a number of overseas postings, including in Jamaica, Japan, Argentina, Chile and Brazil. He retired in 1997.

Peter Donald Whitney, a native of New York, was a 1965 history graduate of Princeton University. He received a master’s degree in economics from Vanderbilt University in 1972 and a master’s degree in public administration from Harvard University in 1975.

After retiring from the State Department, he served as an economist-in-residence at American University until his death. He lived in McLean.

Survivors include his wife of 44 years, Martha Overholser Whitney of McLean; two children, Tyson Peter Whitney of Arlington and Martha Savanna Whitney of Oakland, Calif.; a sister; and two granddaughters.

— T. Rees Shapiro