The most comprehensive dictionary of its type available, The Routledge Dictionary of Pronunciation for Current English is the essential reference for those interested in English pronunciation.
Clive Upton is Emeritus Professor of Modern English Language at the University of Leeds, UK. He edits English Today, co-edited A Handbook of Varieties of English, and his Received Pronunciation transcription model has been used by Oxford English Dictionaries since 1993.
William A. Kretzschmar, Jr. is the Harry and Jane Willson Professor in Humanities at the University of Georgia, USA. He is Editor of the American Linguistic Atlas Project, and he has laid the foundations for analysis of language as a complex system.