Mark Buchanan is a theoretical physicist and an associate editor at Complexus, a journal on biocomplexity. He has been an editor at Nature and New Scientist, and is the author of numerous magazine and newspaper articles in the U.S. and U.K. Buchanan is also the author of two prize-nominated books, Ubiquity: The Science of History and Nexus: Small Worlds and the Groundbreaking Science of Networks. He lives in Cambridgeshire, England.