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Ravi Sethi, director of Computing Science Research, has been at AT&T Bell Laboratories in Murray Hill, New Jersey since 1976. He has held teaching positions at Pennsylvania State university and the University of Arizona, and has taught at Princeton University and Rutgers. Dr. Sethi is co-author of the "dragon book", Compilers: Principles, Techniques and Tools and has written numerous articles. His books have been translated in Japanese, German, French, Italian, Spanish, and Korean.