Ian Graham is a highly experienced author having written over 180 illustrated nonfiction books and contributed many articles for magazines. After completing a degree in applied physics, he earned a postgraduate diploma in journalism at City University, London. He began work as an editor before setting up a freelance business writing and editing, including editing the magazine Space Voyager. His professional interests include, among other things, spaceflight and aviation. Ian now lives in Norfolk in the UK.

Eric von Euw is a Mayanist and epigrapher who currently works in the private sector.