2008-present

Alfréd Rényi Institute of Mathematics, Number Theory Divison, senior research fellow

2006-2008

Alfréd Rényi Institute of Mathematics, Number Theory Divison, research fellow

2003-2006

The University of Texas at Austin, Department of Mathematics, instructor

1999-2003

Princeton University, Department of Mathematics, teaching assistant

1996-1997

University of Illinois at Urbana-Champaign, Department of Mathematics, teaching assistant

1993-1996

Eötvös Loránd University, Department of Algebra and Number Theory, teaching assistant

1992-1996

Budapest Technical University, Department of Mathematics, teaching assistant