He also became a member of the influential Washington - based financial advisory body , the Group of Thirty in 1979 .
He was a director at the Council on Foreign Relations between 1966 and 1981 , and a trustee of the Rockefeller Foundation .
director also became a member of the influential Washington - based financial advisory body , the Group of Thirty in 1979 .
He was a director at the Council on Foreign Relations between 1966 and 1981 , and a trustee of the Rockefeller Foundation .