Susan Conrad is Professor of Applied Linguistics at Portland State University. She has worked in Southern Africa and Korea, and conducted workshops on discourse analysis and corpus linguistics in Europe, South America, and Thailand. Her previous books include Corpus Linguistics, The Longman Grammar of Spoken and Written English, and The Student Grammar of Spoken and Written English.

Douglas Biber is Regents’ Professor of Applied Linguistics at Northern Arizona University. He has worked in Kenya and Somalia, and has been a visiting professor at several universities, including the University of Uppsala, University of Helsinki, University of Zurich, the Freiburg Institute of Advanced Studies, and the Norwegian Academy of Arts and Sciences. His previous books include Variation across Speech and Writing, Dimensions of Register Variation, Corpus Linguistics, The Longman Grammar of Spoken and Written English, and Discourse on the Move.

Geoffrey Leech is Professor Emeritus of English Linguistics at Lancaster University.