Associate Faculty Associate, Mathematics Department, University of Wisconsin - Madison (2000-2003)
Faculty Associate, Mathematics Department, University of Wisconsin - Madison (2003-2006)
Associate Professor, Mathematics Department, University of Wisconsin - Madison (2006-2010)
Professor, Mathematics Department, University of Wisconsin - Madison (2010-)
Chair of the Mathematics Department, UW-Madison (2014-)
Associate Dean for the Natural, Physical and Mathematical Sciences, College of Letters ans Sciences, UW-Madison, (2018-)