Brigitta P.H. Mitchell, 81, a World Bank economist for more than 30 years, died May 4 at the Ingleside at King Farm retirement residence in Rockville, where she had lived for the past two years. She had Parkinson’s disease.

A granddaughter, Juliet Hiznay, confirmed the death.

Mrs. Mitchell began her World Bank career shortly after settling in Washington in 1968. Her specialties included infrastructure projects in West Africa and from 1979 to 1981 she lived in Abidjan, Ivory Coast. In 1996, she received the World Bank’s Award of Excellence. She retired in about 2000.

Brigitta Pauline Heister was born in Oberreifferscheid, Germany. Her father was lost on the Russian front while serving in the German Army during World War II, and in 1945 her family fled Soviet-occupied East Germany through forests and military checkpoints to reach Allied-occupied West Germany.

She studied at Syracuse University in New York on a Fulbright scholarship, and in 1959 received a diploma in economics at the University of Cologne in Germany.

In 1960 she married Roy C. Mitchell Jr. They lived in London before relocating to Washington. He died in 2000.

Survivors include two stepdaughters, Sidney Mitchell of Dover-Foxcroft, Maine, and Lisa Mitchell of Attica, Mich.; two sisters; a brother; six grandchildren; and six great-grandchildren.

— Bart Barnes