| 01/2002 to present | Lead Member of Technical Staff Algorithms and Optimization Research Department Internet and Network Systems Research Center AT&T Labs Research, Florham Park, NJ |
| 05/1999 to 01/2002 | Technology Consultant Algorithms and Optimization Research Department Information Sciences Research Center AT&T Labs Research, Florham Park, NJ |
| 07/1996 to 04/1999 | Principal Research Staff Member Algorithms and Optimization Research Department Information Sciences Research Center AT&T Labs Research, Florham Park, NJ |
| 01/1996 to 06/1996 | Senior Research Staff Member Algorithms and Optimization Research Department Information Sciences Research Center AT&T Research, Murray Hill, NJ |
| 8/1988 to 01/1996 | Member of Technical Staff Mathematical Foundations of Computing Department Mathematical Sciences Research Center AT&T Bell Laboratories, Murray Hill, NJ |
| 09/1987 to 08/1988 | Full-Time Consultant AT&T Advanced Decision Support Systems Whippany, NJ |
| 08/1985 to 08/1987 | Post Graduate Research Engineer Operations Research Center, University of California Berkeley, CA |
| 12/1986 to 08/1987 | Part-Time Consultant AT&T Advanced Decision Support Systems Whippany, NJ |
| 09/1985 to 08/1987 | Part-Time Consultant, Schlumberger Palo Alto Research - Fairchild Palo Alto, CA |
| 06/1985 to 08/1985 | Research Staff Fairchild Advanced Research & Development Laboratory Palo Alto, CA |
| 02/1984 to 07/1985 | Post Graduate Researcher Electronics Research Laboratory, University of California Berkeley, CA |
| 06/1983 to 08/1983 | Research Assistant Operations Research Center, University of California Berkeley, CA |
| 10/1979 to 08/1982 | Senior Engineer Methods & Models Department, Furnas Power Company Rio de Janeiro, Brazil |
| 06/1981 to 08/1982 | Lecturer Department of Economics, Catholic University Rio de Janeiro, Brazil |
| 01/1978 to 07/1978 | Trainee Methods & Models Department, Furnas Power Company Rio de Janeiro, Brazil |