Bill Cotter is a longtime world's fair enthusiast and has traveled to many of these international exhibitions. The author of 11 other books on fairs for Arcadia Publishing, he is a frequent contributor to other books, magazines, and documentaries on world's fairs and has spoken extensively on the subject. His photograph collection of world's fairs, the world's largest, has been featured in museum exhibits, and he operates two popular websites devoted to the fairs.