A colleague and I visited Donald in Toronto in the 1970s and I will always remember his office full of mathematical models. I remember the extreme kindness and wonderful hospitality of Donald and his Dutch wife Rien. When I said I had never had pumpkin pie before, Donald vanished into the kitchen and staggered back with a huge pumpkin which his frail figure hardly looked able to carry.
Ang isang kasamahan ko at binisita Donald sa Toronto sa 1970 s at ako ay palaging tandaan ang kanyang opisina na puno ng mga matematiko modelo. Ko matandaan ang sukdulan ng kabaitan at kahanga-hanga mabuting pakikitungo ng Donald at kanyang asawa Dutch Rien. Kailan ko sinabi ko na hindi nagkaroon kalabasa pie bago, Donald vanished sa kusina at staggered back na may isang malaking-malaking kalabasa na kung saan ang kanyang marupok figure bagang tumingin mai-carry.