Understanding traumatic stress — and how to treat it — has come a long way in the last few decades, in part thanks to the tireless work of Alexander 'Sandy' McFarlane. An Emeritus Professor of Psychiatry at the University of Adelaide, he's worked closely with bushfire survivors, veterans and emergency workers — and been a key advisor to governments, inquiries and royal commissions. Guest: Emeritus Professor Alexander 'Sandy' McFarlane