James P. Lantolf is George and Jane Greer Professor of Language Acquisition and Applied Linguistics, Director of the Center for Language Acquisition, and Co-director of Center for Advanced Language Proficiency Education and Research at The Pennsylvania State University. His research interests include Sociocultural Theory, second language acquisition, metaphor and conceptual knowledge. His is co-author, with S.L.Thorne, of Sociocultural Theory and the Genesis of Second Language Development (2006) and edits the Equinox journal Language and Sociocultural Theory