2008- present. Professor. Department of Linguistics Georgetown University.Head, Applied Linguistics Concentration; 2002-2008
2002-2008. Associate Professor, Department of Linguistics Georgetown University.
1998-2002. Assistant Professor, Department of Linguistics
1995-1998. Assistant Professor, Department of English,
1993-1994. Visiting Scholar, Graduate School of Education,
1991-1993. Lecturer, Language Acquisition Research Center,
Department of Linguistics, University of Sydney



