Ofelia García is Professor in the Ph.D. programs of Urban Education and of Hispanic and Luso-Brazilian Literatures and Languages at The Graduate Center, City University of New York, USA. She is the Associate General Editor of the International Journal of the Sociology of Language. Li Wei is Pro-Vice-Master of Birkbeck College, University of London, UK, where he is Chair of Applied Linguistics and Director of the Birkbeck Graduate Research School. He is Academician of Social Sciences, and Chair of the General & Applied Linguistics, UK, and is Principal Editor of the International Journal of Bilingualism.