Harry Oppenheimer was the chairman of Anglo American Corporation for 25 years and chairman of De Beers Consolidated Mines for 27 years until he retired from those positions in 1982 and 1984 respectively .
Oppenheimer was the chairman of Anglo American Corporation for a quarter of a century . He was also the chairman of De Beers Consolidated Mines for 27 years until he retired from those positions in 1982 and 1984 .