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Mark is professor of Linguistics and Computer and Information Science at the University of Pennsylvania (1990-) and director of the Linguistic Data Consortium (1992-). His research interests are in phonetics, phonology, speech technology and computational linguistics. He is on the editorial boards of Speech Communications, Computer Speech and Language and The International Journal of Corpus Linguistics. Mark came to Penn after being a member of the technical staff and department head of the Linguistics Research Department at AT&T Bell Laboratories (1975-1990).