George Yule has taught Linguistics at the Universities of Edinburgh, Hawaii, Louisiana State and Minnesota. He is the author of a number of books, including Discourse Analysis (with Gillian Brown, 1983) and Pragmatics (1996).
John P. Wilson is Professor of Geography and Director of the GIS Research Laboratory at the University of Southern California in Los Angeles.A. Stewart Fotheringham is Director of the National Centre for Geocomputation at the National University of Ireland, Maynooth.They are both editors of the journal Transactions in GIS, also published by Blackwell.