Kevin McManus is an associate professor in the Department of Applied Linguistics at Penn State University, where he is also director of the Center for Language Acquisition and the Center for Advanced Language Proficiency, Education, and Research. His research focuses on psycholinguistics, crosslinguistic influence, instruction, and usage-based accounts of learning, with particular interests in instructed grammatical learning and the ways in which cognitive and social factors shape development. He also has significant interests in replication research, which has involved conducting and promoting replication studies as well as providing guidance and training in the design, execution, and interpretation of replication studies. His most recent books include Doing Replication Research in Applied Linguistics, Crosslinguistic Influence and Second Language Learning and Usage in Second Language Acquisition. Critical Reflections and Future Directions. He is currently an associate editor for Studies in Second Language Acquisition.