I have wonderful memories of Chris going to back to my earliest student days with him at Harvard. Chris was full of energy -- I remember the light in his office at Pierce Hall burning well beyond midnight --and so exciting to talk to. He was full of ideas and seemed to have at his command every theorem in advanced mathematics, so much so that he could produce a detailed proof of any theorem at a moment's notice. There were also so many fun moments with him -- watching basketball with Dave Gilliam at his apartment, walking the wintry streets of Stockholm, having a great dinner at the Stallmeister restaurant. Chris was a vital force and I shall miss him.