Don was my advisor, greatest teacher, and dear friend. He
was, and remains, the origin of my intellectual universe - he had a huge
influence on me in shaping the person and researcher I am today. All I have done
can be traced back to the superb training I received from Don.

I was scheduled to meet him in a couple of weeks but,
alas, time ran out suddenly.

Don was a true scholar and a gentleman, with a great
sense of humor to boot. His kindness knew no bounds. It was an honor to have
known him.

 I miss him a lot. May he rest in peace.

I am deeply saddened by the news.  Don spent some time with me when I just finished my PhD, over 20 years ago.  We met a few times later.  His enthusiasm for continuum mechanics was inspiring.