Stephen D. Krashen has published over 500 articles and a dozen scholarly books in the fields of literacy, language acquisition, neurolinguistics, and bilingual education. Many of these publications are available for free download at sdkrashen.com. He no longer writes books. Nevertheless, he is the most frequently cited scholar in the field of language education.

Charlene Polio is a professor in the Department of Linguistics, Languages, and Cultures at Michigan State University, where she teaches in the MA Program in Teaching English to Speakers of Other Languages (TESOL) and the PhD Program in Second Language Studies Program. Her main area of research is second language (L2) writing in relation to research methods and to second language acquisition. She is the co-author (with Debra Friedman) of Understanding, Evaluating, and Conducting Research in Second Language Writing (Routledge) and the co-editor (with Rosa Manchon) of The Routledge Handbook of Writing and Second Language Acquisition. She is the co-editor of TESOL Quarterly and a consulting editor for the new journal, Research Methods in Applied Linguistics (Elsevier).

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

Celeste Kinginger is a professor of Applied Linguistics at the Pennsylvania State University where she teaches qualitative and narrative research methods at the doctoral level. She is the author of numerous books and articles on environments for learning, second language pragmatics, and multilingual life writing. She is currently completing a book and video profile series from a large-scale, mixed-methods project on the careers of language study abroad alumni.

Jiang Nan is a professor of second language acquisition at the University of Maryland. His research interests include lexical representation and development in a second language, morphosyntactic processing, semantic development, bilingual language processing. He has published numerous articles in SLA, Applied Linguistics, and Psycholinguistics journals. He is also the author of Conducting Reaction Time Research in Second Language Studies (Routledge, 2002) and Second Language Processing: An Introduction (Routledge, 2008). 

Liu Shuyuan is a PhD candidate in Applied Linguistics at the Pennsylvania State University, where she provides instruction in undergraduate and graduate-level courses on English academic communication and Global English. Her research interests include English as a lingua franca (ELF), intercultural pragmatics, sociocultural theory, and study abroad. She has first-authored papers published and forthcoming in Foreign Language Annals and the Journal of Pragmatics, and has served as a reviewer for Foreign Language Annals and the TESOL International Convention. She is currently working on her dissertation which investigates the multimodality, spatiality, and sociocultural genesis of ELF pragmatics in synchronous online academic communication.

Zhuang Jingyuan is a PhD candidate in Applied Linguistics at the Pennsylvania State University (M.S. Linguistics, Georgetown University). Her research interests include second language acquisition and study abroad. She has published studies in edited volumes and presented her work at leading academic conferences in the field. Her dissertation project, on approaches to modality in English as a Second Language from cognitive linguistics and concept-based instruction, has received the EuroSLA 30 Junior Researcher Grant and the Language Learning Dissertation Grant.