Dr Lachlan McIver is an Australian doctor who's worked in some of the world's wildest and most remote places. He specialised as a rural generalist and his work in humanitarian medicine has taken him from remote Indigenous communities in Australia, to the Pacific, to natural disasters and civil war zones in the Middle East and Africa. These days, Dr McIver is based in Geneva, where he works with Médecins Sans Frontières as a Tropical Diseases & Planetary Health Advisor. He's also just written his first book; Life and Death Decisions, using his wide-spanning career to examine some of the biggest health challenges of our age; climate change, health inequities, and drug-resistant infections.