Professor of Linguistics, University of New Mexico

Professor Emeritus of Linguistics, Brigham Young University

Columbia University

Uppsala University

Radboud University Nijmegen, CLS

Visiting Scholar, Dept. of French & Italian, Indiana University

University of Manchester

Professor of Linguistics and Pragmatics, MAE, The University of Manchester

Professor of Linguistics, University of California, Berkeley

Assocate Professor in Applied Linguistics, University of Leicester