Professor Das has been Ex-President of the Delhi Ophthalmological Society, and has received the Delhi state award. He is a life member of Glaucoma society of India, all India ophthalmic society and Delhi Ophthalmological society. He has numerous publications in National and International journals to his credit, and has performed the maximum Number of glaucoma valve (AGV) surgeries in India. He has also been invited to deliver a lecture on glaucoma valve by the japan Ophthalmological society. He has completed who fellowships at the john Hopkins Hospital, USA and the wills eye Hospital, USA, and has been a visiting professor at the Kurlsrhuhe University, Germany.