Prof. Krishnan will be deeply missed. I remember my first interaction with him back in 2009 during a conference at IISc. I didn't realize then that one year down the line I would be a Graduate student and would be working with one of his students (Vimlesh Kumar). I had the privilege to interact with him quite a few times, the most extensive one being in the SERC School in Neuroscience in Feb 2012. My most memorable moment with him was when he put his arm on my shoulder and said"He is my grandstudent." It was such a proud moment. He was an inspiration to all of us and the best part of him was his child-like curiosity and one could chat with him for hours together without a dull moment. His absence cannot be filled but his science will continue to live among us, the lot that he has inspired.