sentences:  From 1980 to 1983, he was director of the Names Research Unit of the University of Essex, England, where he began a PhD under the supervision of Yorick Wilks.In 1983, he was appointed managing editor of COBUILD, and in 1987 he took on the additional role of chief editor of English dictionaries for Collins (now HarperCollins).In the summer of 1988 and 1989 he was a visiting scientist at AT&T Bell Laboratories in Murray Hill, NJ, where he co-authored with Ken Church influential papers on corpus-based statistical methods in lexical analysis.