· Professor, Columbia University2017–
· Interim Chair, Department of Computer Science, Columbia University2015–2015
· Vice-Chair, Department of Computer Science, Columbia University2012–2018
· Associate Professor, Columbia University2010–2016
· Visiting Fellow, Princeton University2010–2011
· Assistant Professor, Columbia University2003–2006
· Lecturer in Applied Mathematics, Harvard University2002–
· PhD in Computer Science, Harvard University2001–
· Mathematical Sciences Postdoctoral Fellow, National Science Foundation2001–2002
· M.S., Computer Science, Harvard University1997–
· A.B., Mathematics, Harvard University1993–