He was the chairman and chief executive officer of Institute of Strategic and International Studies (ISIS), a major think tank of Malaysia.
He married Puan Sri Shamsiah Hashim in 1968 and they have three sons: Johan, Shamsul and Amirul.
Malaysia's top leaders and important figures attended his funeral and mourned his death.
In numerous interviews given by his youngest son, Amirul, he said that he had learned a lot from his father who was a simple and enigmatic man.
Throughout 1963, Sopiee ran a series of seminars pertaining to Indonesian threats to Malaysia in the sphere of psychological warfare.