Michael Swords, who was a professor of Natural Science at Western Michigan University for 30 years, is the primary author of the United States chapters. The work was coordinated and edited by Robert Powell. Clas Svahn, Vicente-Juan Ballester Olmos, Bill Chalker, and Robert Powell contributed country chapters. Jan Aldrich was the primary content consultant, with additional content consultation and writing coming from Barry Greenwood and Richard Thieme. Steve Purcell was the primary photo illustration editor.
