2005-2008 Associate Chair, Department of Linguistics, University of Michigan
2002-present Full Professor, Department of Linguistics, University of Michigan
1997-2001 Associate Professor, Department of Linguistics, University of Michigan
1992-1997 Associate Professor, Linguistics Department, Harvard University
1988-1992 Assistant Professor, Linguistics Department, Harvard University
1987-1988 Lecturer, Linguistics Department, University of Texas at Austin