- Professor (2002 – Present), Koç University, Department of Industrial Engineering, İstanbul, Turkey
- Professor (2014-2105), Visiting positions at The George Washington University (Washington, DC, USA), Queensland University of Technology (Brisbane, Australia), University College London (London, UK)
- Professor (1990 – 2002), Boğaziçi University, Department of Industrial Engineering, İstanbul, Turkey
- Visiting Professor (1999 – 2001), The George Washington University, Joint appointment in the Department of Engineering Management and Systems Engineering and the Department of Management Sciences, Washington, DC, USA
- Visiting Senior Fellow (1991 – 1993), National University of Singapore, Faculty of Business Administration, Department of Decision Sciences, Singapore
- Associate Professor (1985 – 1989), Boğaziçi University, Department of Industrial Engineering, İstanbul, Turkey
- Visiting Assistant Professor (1984 – 1985), Northwestern University, Kellogg Graduate School of Management, Department of Managerial Economics and Decision Sciences, Evanston, Ill., USA
- Assistant Professor (1979 – 1980, 1981 – 1984), Boğaziçi University, Department of Industrial Engineering, İstanbul, Turkey
- Lieutenant (1980 – 1981), Turkish Land Forces, School and Education Center of Finance and Ordnance, Department of Planning and Programming, İstanbul, Turkey
- Research Assistant (1976 – 1979), Northwestern University, Department of Industrial Engineering and Management Sciences, Evanston, Ill., USA
- Teaching Assistant (1973 – 1975), Boğaziçi University, Department of Mathematics, İstanbul, Turkey