Chalcid, Johannesburg Thirty Seventh President (2022-2023)

ORSSA Fellow, Johannesburg Thirty Sixth President (2021)

Chalcid, Johannesburg Thirty Fifth President (2020)

Department of Industrial Engineering, Stellenbosch University Thirty Fourth President (2018-2019)

Defence, Peace, Safety and Security CSIR, Pretoria Thirty Third President (2016-2017)

School of Mathematical and Physical Sciences, North-West University Thirty Second President (2014-2015)

Department of Logistics Stellenbosch University Thirty First President (2012-2013)

Development Bank of Southern Africa, Johannesburg Thirtieth President (2010-2011)

Department of Industrial Engineering, University of Pretoria Twenty Ninth President (2008-2009)

SASOL Technology Secunda Twenty Eighth President (2006-2007)

Business School, University of Stellenbosch Twenty Seventh President (2004-2005)

CSIR, Pretoria Twenty Sixth President (2002-2003)

Department of Applied Mathematics University of Stellenbosch Twenty Fifth President (2000-2001)

School of Mathematics & Statistics University of Natal Twenty Fourth President (1998-1999)

Informationtek, CSIR, Pretoria Twenty Third President (1996-1997)

Department of Quantitative Management, University of South Africa Twenty Second President (1994-1995)

ARMSCOR, Pretoria Twenty First President (1992-1993)

Standard Bank, Johannesburg Twentieth President (1990-1991)

Department of Quantitative Management University of South Africa Nineteenth President (1988-1989)

National Research Institute for Mathematical Sciences, CSIR, Pretoria Eighteenth President (1987)

ARMSCOR, Pretoria Seventeenth President (1986)

AECI, Johannesburg Sixteenth President (1985)

Department of Statistics University of the Witwatersrand Fifteenth President (1984)

Senbank, Johannesburg Fourteenth President (1983)

Anglo American, Welkom Thirteenth President (1982)

Department of Statistical Sciences University of Cape Town Twelfth President (1981)

ARMSCOR, Pretoria Eleventh President (1980)

Department of Quantitative Management, University of South Africa Tenth President (1979)

Department of Statistics University of Cape Town Ninth President (1978)

Eighth President (1977)

SANLAM, Bellville Seventh President (1976)

City Council, Johannesburg Sixth President (1975)

CALTEX, Cape Town Fifth President (1974)

Department of Posts & Telecommunication, Pretoria Fourth President (1973)

Senbank, Johannesburg Third President (1972)

Department of Mathematical Statistics, University of South Africa Second President (1971)

Graduate Business School, University of the Witwatersrand Founding President (1970)