· Area Chair for Computer Science, Harvard University2017–2019
· Harvard College Professor, Harvard University2016–2021
· Vicky Joseph Professor of Computer Science and Applied Mathematics, Harvard University2009–
· Director, Harvard Center for Research on Computation and Society (CRCS), Harvard University2008–2011
· Gordon McKay Professor of Computer Science and Applied Mathematics, Harvard University2007–2009
· Thomas D. Cabot Associate Professor of Computer Science, Harvard University2004–2006
· Fellow, Radcliffe Institute for Advanced Study, Harvard University2003–
· Assistant Professor, Harvard University2001–2004
· Visitor, School of Mathematics, Institute for Advanced Study2000–2001
· NSF Mathematical Sciences Postdoctoral Fellow, Massachusetts Institute of Technology1999–2000
· Certificate of Advanced Study in Mathematics, Churchill College, Cambridge University1995–1996
· Ph.D. in Applied Mathematics, Massachusetts Institute of Technology1995–1999
· A.B. in Mathematics and Computer Science, Harvard University1991–1995