Steve knows way more about Harry Potter than anyone ever should and loves sharing what he's discovered with fans all over the world. He's the webmaster and editor of the Harry Potter Lexicon website, the premier reference source about the world of Harry Potter, and a popular presenter at Harry Potter events. His podcast (ingeniously entitled "The HP Lexicon Podcast") takes listeners on an entertaining ramble through the Harry Potter books.

Vander Ark, who has read the Potter novels many times, has been interviewed by the BBC, the Today Show, the New York Times, Time Magazine, the Associated Press, the New Yorker, the London Times, the Guardian. His interview for an A&E television special on the series appears as part of the extra section on the DVD edition of Harry Potter and the Order of the Phoenix.

A former school media specialist, Vander Ark has been honored by fans of the series who appreciate his insights into the party books. The Association for Library Services for Children, a division of the American Library Association, has named the Lexicon website one of the 15 "Great Web Sites For Kids." It has also been named a USA Today Hot Site.

Steve is also the author of In Search of Harry Potter and the Reader's Guide to Harry Potter and the Philosopher's Stone.