John Thorn is the preeminent historian of baseball. He conceived and edits Base Ball: A Journal of the Early Game. Along with Pete Palmer he created and edited Total Baseball. He was an on-screen historian and the chief consultant to Ken Burns’s PBS series “Baseball.” Mr. Thorn appears frequently on ESPN, the MLB Network, the History Channel, and other television outlets. He is a coauthor of The Hidden Game of Baseball, which helped to establish alternative statistics that are now recognized officially by Major League Baseball. He currently serves as publishing consultant to the Pro Football Hall of Fame and the Museum of the City of New York.