We are shocked and saddened by this unbelievable news.
Jon was an absolutely brilliant mathematician and visionary with incredible gifts also for exposition, for sharing mathematics, and for inventing new ways of doing mathematics. Jon was also a fantastic person who was friendly, encouraging and loving; and he was full of fun and vigour.
We lovingly remember our supper together on July 7th at Massey’s Indian restaurant, and Jon’s great colloquium talk delivered on the same day. Here attached is a poster we made in Jon’s honour for his talk at Western.
We are sending our deepest and most heartfelt condolences and our love to you, to David and Bessie, to Naomi, Rachel and Tova; as well as to your grandchildren and to your entire extended family. [Jan and Leslie Minac, Western University, London, Ontario, Canada]