Chartered engineer, United Kingdom and Commonwealth Countries. Assistant engineer Bombay Electricy Board (India), 1955-1956. Instructor Illinois Institute of Technology, 1958-1963.
Assistant professor Indian Institute of Technology, Madras, 1963-1965, examiner for Doctor of Philosophy. degrees, 1967-1972. Manager computer administration Dunlop India, Calcutta, 1965-1973. Computer consultant Dunlop Industries, Kuala Lumpur, Malaysia, 1973-1978.
Group data processing/information systems manager Sime Darby Berhad, Kuala Lumpur, 1978-1984. Senior fellow department computer science National University Singapore, since 1984. Visiting scholar, honorary fellow University Minnesota, 1986.