· Director of the Center for Data Science for Enterprise & Society, Cornell University2019–
· Director, School of Operations Research & Information Engineering, Cornell University2013–2017
· Laibe/Acheson Professor of Business Management & Leadership Studies, Cornell University2013–
· Professor of Operations Research & Information Engineering and of Computer Science, Cornell University1997–
· Associate Professor of Operations Research & Information Engineering and of Computer Science, Cornell University1992–1996
· Assistant Professor of Operations Research & Information Engineering, Cornell University1989–1992
· Associate Professor of Applied Mathematics, Massachusetts Institute of Technology (MIT)1989–1990
· Postdoctoral Researcher, Mathematical Sciences Research Institute (MSRI)1986–
· Assistant Professor of Applied Mathematics, Massachusetts Institute of Technology (MIT)1985–1989
· Postdoctoral Researcher, Harvard University1984–1985
· PhD in Computer Science, University of California, Berkeley1984–
· B.S.E., Electrical Engineering and Computer Science, Princeton University1981–
· Mathematician, National Bureau of Standards1980–