Clifford Nass, RIP

I just heard, through Matt Richtel’s appreciation, the very sad news that Clifford Nass died over the weekend of a heart attack. He was 55 and, as a colleague of his at Stanford said, “at the peak of his career.” I found Cliff’s research on human-computer interaction to be invaluable, and I had the great pleasure of meeting him once and talking with him several times. He and his work will be missed.