Heart surgeon Stephen Westaby has saved thousands of patients throughout his 40 year career but it’s the deaths that stick with him. As a teenager he was smart but felt he wasn't bold enough to make the split-second life and death decisions required of a surgeon. It wasn’t until medical school when a rugby accident damaged the part of his brain that controls inhibition and risk-taking, that Professor Westaby overcame his shyness. He would become famous for complex paediatric surgeries and would pioneer the use of a small artificial heart. (Photo courtesy of Stephen Westaby.)