· Dean of Science, Massachusetts Institute of Technology (MIT)2013–2020
· Head of the Mathematics Department, Massachusetts Institute of Technology (MIT)2004–2014
· Chair of Applied Mathematics, Massachusetts Institute of Technology (MIT)1998–2000
· Professor, University of California at Berkeley1985–1986
· Research Staff Member, IBM Research1980–2020
· Donner Professor of Mathematics, Massachusetts Institute of Technology (MIT)1980–
· PhD in Engineering, University of California/Berkeley1980–
· Research Assistant, Massachusetts Institute of Technology (MIT)1979–1980
· BA in Mathematics, Cornell University1974–