The military ordered big steps to stop extremism. Two years later, it shows no results

Researcher and teacher Mitchell Halperin worked in one of the more complex corners of medicine. As a nephrologist – kidney doctor – at St. Michael’s Hospital in Toronto for 50 years, he taught and conducted basic research on renal physiology related to fluid, electrolyte and acid-base homeostasis. “He had an ability to put things in perspective, to put across concepts that were intellectually challenging. He could distill them down to their simple fundamentals, so even a child could see,” says Tony Fields, who learned from Dr. Halperin at St. Michael’s Hospital and the University of...