1974-1975 | Assistant Professor (jointly in the Electrical Engineering and in the Computer Science and Operation Research Departments), Southern Methodist University, Dallas |
1975-1977 | Assistant Professor, Department of Applied Mathematics and Computer Science, School of Engineering and Applied Science, University of Virginia, Charlottesville |
1977-1979 | Assistant Professor, Department of Engineering Science and Systems, School of Engineering and Applied Science, University of Virginia, Charlottesville |
1978 | Visiting Scientist, Centre National de la Recherche Scientifique, Laboratoire d'Automatique et d'Analyse des Systemes, Toulouse, France |
1979-1983 | Associate Professor, Department of Engineering Science and Systems, School of Engineering and Applied Science, University of Virginia, Charlottesville |
1983-1989 | Professor, Department of Systems Engineering, School of Engineering and Applied Science, University of Virginia, Charlottesville |
1984-1986 | Member, Technology Planning Committee for Knowledge Diagnostic Systems, Institute of Textile Technology, Charlottesville |
1984-1990 | Chair of the Department of Systems Engineering, School of Engineering and Applied Science, University of Virginia, Charlottesville |
1986-1990 | Director, Center for Communications Networks, a University Center at the University of Virginia |
1989-1990 | Nancy and Neal Wade Professor of Systems Engineering, School of Engineering and Applied Science, University of Virginia, Charlottesville |
1990-1993 | Chair of the Department of Industrial and Operations Engineering, University of Michigan, Ann Arbor |
1990-2001 | Professor of Industrial and Operations Engineering, University of Michigan, Ann Arbor |
1992-1993 | Co-Director, Michigan Joint Manufacturing Institute (now the Tauber Manufacturing Institute) |
1993-1994 | Senior Associate Dean, College of Engineering, University of Michigan, Ann Arbor |
1994-2001 | Professor of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor |
| Director, ITS Research Center of Excellence, Ann Arbor |
| Director, ITS Certificate Program, Ann Arbor |
| Director, EECS ITS Laboratory, Ann Arbor |
1995-2001 | Co-Director, Sloan Trucking Industry Program |
since 1998 | Member, Board of Advisors, Kinetic Computer Corporation, Billerica |
1999-2000 | Interim Chair of the Department of Industrial and Operations Engineering, University of Michigan, Ann Arbor |
since 2001 | Member, Board of Advisors, CenterComm Corporation, San Diego |
2002-2004 | ISyE Chair of Transportation and Logistics, School of Industrial and Systems Engineering, Georgia Institute of Technology, Atlanta |
2003-2005 | Director, Georgia Transportation Institute (GATI) |
| Member, Dean's Faculty Advisory Council |
| Executive Director, The Logistics Institute (TLI) |
since 2002 | Director, Sloan Trucking Industry Program |
since 2004 | Schneider National Chair of Transportation and Logistics, School of Industrial and Systems Engineering, Georgia Institute of Technology, Atlanta |
since 2005 | Chair, H. Milton Stewart School of Industrial and Systems Engineering, Georgia Institute of Technology, Atlanta |