Regents' Professor Applied Lingusitcs Northern Arizona University

Portland State University

University of Edinburgh / George Mason University

Georgia State University

Department of English, City University of Hong Kong

Professor of English Language and Linguistics at UNED

Humber College & University of Toronto

Chair in English Language and Linguistics. University of Santiago de Compostela

Professor of Linguistics, University of Botswana

Babcock University, Ilishan Remo, Ogun State, Nigeria