Master of Science, University Calcutta, Kolkata, India. Master of Philosophy, University Calcutta, Kolkata, India. Doctor of Philosophy, University Calcutta, Kolkata, India, 1995.
Lecturer Darjiling Government College, India, 1989—1995, assistant professor. Reader Presidency College, Kolkata, 1995—2000. Professor University Calcutta, since 2000.
Countrywide audio-visual classroom for students AVRC-U. Grants Commission, Kolkata, 1995—2000. Nature study physically challenged students Wanderlust, since 1995. Member of National Academy of Sciences, Botanical Society Bengal, Indian Fern Society, Palaeobot.
Married Sreelekha De, March 10, 1988. 1 child Meghma.