Rajjan Shinghal retired as Professor of computer science from Concordia University, Montreal. A PhD in computer science from McGill University, Montreal, he has over 30 years of experience in teaching and research. He has published research papers in many conference proceedings and in a wide variety of journals such as Expert Systems, Pattern Recognition, and the various IEEE Transactions. He has authored a book, Formal Concepts in Artificial Intelligence, published by Chapman & Hall, London, and co-published with Van Nostrand, New York. He has also co-edited a book, Operational Expert System Applications in Canada published by Pergamon Press.