written by Margaret Koval ; produced and directed by Margaret Koval and Lyn Goldfarb ; produced by Goldfarb and Koval Productions in association with PBS and Devillier Donegon Enterprises
produced by Gardner Films Inc. for History ; producer, Robert Gardner ; head writer, Carrie Gardner ; executive producer for History, Beth Dietrich Segarra
a Unicorn Project presents ; based on the book City by David Macaulay ; produced and directed by Larry Klein ; written and co-produced by Mark Olshaker