Keith Johnson is Professor of Linguistics at the University of California, Berkeley. He is also the author of Quantitative Methods in Linguistics, and the 6th edition of Peter Ladefoged's A Course in Phonetics.
""Looking to offer a balanced, student-friendly approach to speech, with lively sidebars on related topics, this updated edition is intended to reflect the latest advances in the field."" (Times Higher Education Supplement {Texbook Guide}, 3 November 2011)