My sincere condolences to the whole family. I am just a fan of Joe's work and not a personal friend, but I had the great fortune of meeting him when he joined us at a Pittsburgh convention in 2009. He was a remarkable gentleman filled with good humor and his work is admired by so many.
There are videos on YouTube of Joe in Pittsburgh and his enthusiasm (if not outright joy) is very evident.
Rest in peace, Joe. We'll miss you.