Bachelor of Science cum laude, University Pretoria, 1949. Master of Science cum laude, University Pretoria, 1951. Doctor of Philosophy cum laude, University Zûrich, Switzerland, 1954.
Doctor of Science (honorary), University South Africa, Pretoria, 1989. Doctor of Science (honorary), University Cape Town, 1990. Doctor of Science (honorary), University Stellenbosch, 1991.
Doctor of Science (honorary), University Pretoria, 1994.
Research worker Klipfontein Organic Products, Transvaal. Research officer then senior research officer Council for Science and Indiana Research, Pretoria, 1954-1958. Senior lecturer University Stellenbosch, Cape Province, 1958-1965, professor organic chemistry, 1966-1978.
Deputy president Council of Science and Industrial Research, Pretoria, 1979-1980, president, 1980-1990. Chancellor University South Africa, 1990-2000. Member council University South Africa, Pretoria, 1980-1990.
Member Advisory Council for Technology, Pretoria, 1987-1989, National Commission for higher education, 1995-1996. Board directors Technology Finance Corporation, Johannesburg, 1987-1989. Chairman certified board Technikons, Pretoria, 1988-1995.
Chairman Foundation Research and Development, 1990-1992. Chairman Science Advisory Council, Pretoria, 1991-1994. Member Productivity Advisory Council, Pretoria, 1991-1992.
Board directors Allied Technologies, Ltd., 1991-1996, vice president Hans Merensky Foundation. Member International Union of Pure and Applied Chemistry-United Nations Educational, Scientific and Cultural Organization International Chemistry Council, 1995-1999. Trustee Trust for Health Systems Planning and Research, 1992-1994.
Member South Africa Chemical Institute (council 1970-1979, president 1973-1974, gold medal 1980, Van Eck medal 1991), South Africa Academy of Sciences and Arts (chairman 1983, council, Havenga prize for chemistry 1977, MT Steyn medal 1990), South Africa Association for the Advancement of Science (South Africa medal 1990), Percy Fox Foundation (award of merit 1991).
South Africa Chemical Institute (council 1970-79, president 1973-74, gold medal 1980, Van Eck medal 1991)
1970 - 1979
South Africa Academy Sci. and Arts (chairman 1983, council, Havenga prize for chemistry 1977, MT Steyn medal 1990)
South Africa Association Advancement Sci. (South Africa medal 1990)
Percy Fox Foundation (award of merit 1991).
Married Barbara Zacharia Gertruida Viljoen, December 14, 1957. Children: Andris Wilhelm Friedrich, H. Viljoen, Christoph Johan, Barbara H.