1984 - present: Professor, Operations Management and Quantitative Methods, The Paul Merage School of Business, University of California, Irvine

1985 - 1989: Associate Dean, Graduate School of Management, University of California, Irvine

1982 - 1984: Associate Professor, Operations Management and Quantitative Methods, Graduate School of Management, University of California, Irvine

1978 - 1982: Senior Lecturer, Operations Research and Industrial Management, School of Mechanical and Industrial Engineering, The University of New South Wales, Australia

1972 - 1978: Lecturer, Operations Research and Industrial Management, School of Mechanical and Industrial Engineering, The University of New South Wales, Australia

1971 - 1972: Operations Research Analyst for a firm in the steel industry, Broken Hill Pty., Ltd., Duties included scheduling, queuing analysis and process optimization.