staff in the Computing Techniques Research Department, and in 1980 he was appointed head of the Computing Principles Research Department. Dr. Aho received a B.A.Sc. (engineering physics, 1963) from the University of Toronto and a Ph.D. (electrical engineering/computer science, 1967) from Princeton University. Dr. Aho's personal research is centered on data networking, multimedia information systems, database systems and query languages, programming languages and their compilers, algorithms, and the theory of computing. He has published more than 60 technical papers and ten widely used textbooks in these areas. He is a co-inventor of the AWK programming language and other UNIX system tools. Dr. Aho is a fellow of the ACM, the American Association for the Advancement of Science, Bell Laboratories, and the IEEE. He is a former chair of the ACM's SIGACT and a former member of the Computer Science and Telecommunications Board.

Marcia C. Linn is professor of development and cognition and of education in mathematics, science, and technology in the Graduate School of Education at the University of California, Berkeley. A fellow of the American Association for the Advancement of Science, she researches the teaching and learning of science and technology, gender equity, and the design of technological learning environments. In 1998, the Council of Scientific Society Presidents selected her for its first award in educational research. From 1995–1996 she was a fellow at the Center for Advanced Study in the Behavioral Sciences. In 1994, the National Association for Research in Science Teaching presented her with its Award for Lifelong Distinguished Contributions to Science Education. The American Educational Research Association bestowed on her the Willystine Goodsell Award in 1991 and the Women Educator's Research Award in 1982. Twice she has won the Outstanding Paper Award of the Journal of Research in Science Teaching (1975 and 1983). She has served on the board of the American Association for the Advancement of Science, the Graduate Record Examination Board of the Educational Testing Service, and the McDonnell Foundation Cognitive Studies in Education Practice board. Her publications include Computers, Teachers, Peers — Science Learning Partners, with Sherry Hsi (Lawrence Erlbaum & Associates, in press); "Key to the Information Highway" in Communications of the Association for Computing Machinery (1996); "The Tyranny of the Mean: Gender and Expectations" in Notices of the American Mathematical Society (1994); Designing Pascal Solutions, with M.C. Clancy (W.H. Freeman, 1992); and "The Case for Case Studies in Programming Instruction," with M.C. Clancy in Communications of the Association for Computing Machinery (1992).



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