We knew Dr. K.S.Krishnan from 1973, when he was at BARC at Trombay. He was at that time deciding to do PHD at IISc Bangalore. I was at TIFR/Mumbai working with DR. M.R. Das. He was instrumental in inspiring me to continue my Doctoral Studies at U.Massachusetts at Amherst. We overlapped at Amherst for 6 months with Dr. John F. Brandts. He was good in science as wells as in Electronics and able to repair Microcalorimeter which impressed Dr. John F. Brants and asked Dr. Krishnan to stay for longer period of time. His son Kartik was born at nearby Cooley Dickenson Hospital, Northampton,MA. His wife Chandra Krishnan is also a very loving person. We have had contact with him for so many years and it was revived when he came to NIH for 2 years with Dr. Howard Nash's Lab. Last I met him at NCBS in March of 2012. He was at that time as interested in Biology as he was in 1973 meeting. I got yesterday the e-mail for Dr. Bondada Subbarao while I waiting at O'Hare airport after attending the wedding of another former TIFR colleague Dr Radheshyam Jaiswal's daughter. My wife Lakshmi and I were shocked when we heard of Dr. Krishnan's heart attack. He wanted to go back to Palghat where he grew up and had constructed a house. His devotion to Science one can say lasted the final second of his life. My condolences to Mrs. Chandra Krishnan, his sons Kartik, Anand, his co-brother-n law Dr. and Mrs. Gopal and Raji Gopal. Dr. T.V. Gopal also is a TIFR alumni and like Dr. Krishnan is also BARC training school officer before pursuing his PH.D. It is a great loss for us. Easwara Iyer Sadasivan