Organiser of the International Conference on Variational Problems in Applied Mathematics, University of Kinshasa, Congo, 21-26 August 1995.
Co-organiser with R Anguelov:Centenary workshop on Mathematical Epidemiology, University of Pretoria, 21 - 25 April 2008.
Co-organiser with R Anguelov:Centenary workshop on Mathematical Epidemiology, University of Pretoria, 26 April -3 May 2010.
Organiser: Properties Preserving Numerical Schemes for Differential Equations, Symposium at the International Conference on Numerical Analysis and Applied Mathematics, 18 – 22 September 2009, Rethymno, Crete, Greece.
53rd Annual Congress of the South African Mathematical Society, 3-5 November 2010, University of Pretoria, Congress hosted by the Department of Mathematics and Applied Mathematics under my headship.
Co-organiser with BD Reddy: Special session on Theoretical and numerical aspects of dynamical systems, partial differential equations and inequalities, arising in applications, Joint Congress of the South African and American Mathematical Societies, 29 November -3 December 2011, Port Elizabeth.
Member of the Steering Committee from 2011: Annual International BIOMATH Conference, Sofia, Bulgaria
Member of Scientific Committee: IEEE 4th International Symposium on Plant Growth Modeling, Simulation, Visualization and Applications, Shangai, China, 31 October – 3 November 2012.
Co-chair of the Joint UNISA-UP Workshop on Theoretical and Mathematical Epidemiology, 3-8 March 2014, Florida Campus of UNISA
Co-chair of the second Joint UNISA-UP Workshop on Theoretical and Mathematical Epidemiology, 2-7 March 2015, HPC, University of Pretoria
Co-organiser, Mini-Workshop on Theoretical and Mathematical Epidemiology, 12 June 2015, University of Pretoria.
Organiser: Biomath Satellite Conference, 13-17 July 2015, University of Pretoria
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