· Professor of Applied Mathematics, Massachusetts Institute of Technology (MIT)2002–
· Associate Professor, Massachusetts Institute of Technology (MIT)1999–2002
· Assistant Professor of Applied Mathematics, Massachusetts Institute of Technology (MIT)1992–1999
· Simons Professor of Mathematics, Massachusetts Institute of Technology (MIT)1992–
· Mathematical Consultant, AT&T Bell Laboratories1990–
· NSF Mathematical Sciences Postdoctoral Research Fellow, Massachusetts Institute of Technology (MIT)1990–
· PhD in Computer Science, Massachusetts Institute of Technology (MIT)1990–
· BS in Computer Science, Brandeis University1983–