A sad loss. I was lucky enough to meet him, some time after the new millennium. He was with Microsoft by then but still the name on the Gordon Bell Prize. And was keen to drop into our, then Unix based, supercomputer facility, so, clearly interested in HPC even then.
He came across as a very intense person, really, really keen to get his point across accurately, what ever it was. Enjoyed a meal with him.
Davo