Bruce Grierson is a freelance writer with a focus on science and sport. He is the author of U-Turn: What If You Woke Up One Morning and Realized You Were Living the Wrong Life? as well as What Makes Olga Run?, a forensic exploration of the psychology and physiology of masters athletes. He has written for Time, the New York Times Magazine, Scientific American, The Guardian, Popular Science, Pacific Standard, the Walrus, and Psychology Today, among many other publications. He lives with his wife and two daughters in North Vancouver, BC.