In Memoriam – V. S. Varadarajan
I first met Varadarajan in January 1958, and maintained a closefriendship with him till he passed away in April 2019. He wasknown to all his friends as Raja, and that is how I shall referto him in the rest of this article. I learned much from him andcollaborated with him on two book-sized works.I am honoured to be asked to write about him. In my view, he wasone of the best mathematicians of Indian origin to have workedin the second half of the 20th century. I have divided this articleinto three parts. The first gives a brief description of his life. Thesecond part deals with some highlights of his work. The last partis devoted to some personal recollections. There I will describesome vignettes of our long friendship.