University of British Columbia
, Department of Mathematics:
Full Professor, July 1998-present
Associate Professor, July 1996-June 1998.
, Department of Mathematics and Statistics:
Associate Professor, July 1992-July 1996
Assistant Professor, July 1987-July 1992.
Chamber of Mines Research Laboratories
, Johannesburg, Senior Research Officer, August 1979-July 1983.
University of the Orange Free State
, Junior Lecturer, Department of Applied Mathematics, April 1978-July 1979.
, Johannesburg, Mathematics Department, Lecturer, Aug.1977-March 1978 .