A brief account of Johnson's training and academic jobs.
A linguist and a phonetician at the University of California, Berkeley, Keith Johnson's research centers around the nature of phonetic knowledge and the idea that phonetic knowledge is best thought of as inclusive of all of one's experiences as a speaker or hearer. He implemented this conception of phonetic knowledge in exemplar-based models.
Ultimately, linguistic phonetics is concerned with how phonetic factors influence the sound patterns of language, this means that explaining sound change is the ultimate goal of linguistic phonetics. In addition to using techiques of behavioral science to study speech production and perception, Johnson also helped to develop some new methods in neurophonetics to study these processes.