Peter I. De Costa is an Associate Professor in the Department of Linguistics, Languages & Cultures and the Department of Teacher Education at Michigan State University, where he directs the Master’s in TESOL program. As a critical applied linguist, his research areas include emotions, identity, ideology and ethics in language learning, language teaching, and language policy. In addition, his ecologically- and social justice-oriented work looks at the intersection between second language acquisition (SLA), second language teacher education (SLTE), and language policy. He is the co-editor of TESOL Quarterly and the First Vice-President of the American Association for Applied Linguistics.

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