David Baker is a history and science writer for SimonWhistler.com who holds the world's first PhD in Big History. He has delivered award-winning lectures at Macquarie University and the University of Amsterdam, is a visiting lecturer at the University of Paris-Sorbonne, and wrote the YouTube series Crash Course Big History, hosted by John and Hank Green in partnership with the Gates Big History Project. He is also the author of The Shortest History of the World.