85 was the age of the person . The person named David Ronald de Mey WarrenAO died on July 19,2010 . Defence Science and Technology Organisation are the institutions David Ronald de Mey WarrenAO worked at . On March 20, 1925 a person named David Ronald de Mey WarrenAO was born
David Ronald de Mey WarrenAO was born in 20th century