My main research interests lie in the areas of second language acquisition (SLA) and second language instruction. In particular, I research the roles of tasks, input, interaction and individual differences in instructed second language development. I am also interested in the cognitive processes underlying second language  performance and development. My current projects investigate the cognitive processes involved in second language writing and reading, the role of input-based tasks in second language learning, and sources of difficulty in second language listening.

I serve as associate editor of the journal Studies in Second Language Acquisition, co-editor of the John Benjamins Task-based Language Teaching series, and president of the International Association for Task-based Language Teaching (TBLT). I am also on the advisory board of IRIS, a digital repository of instruments for research into second language learning and teaching.