Steve Vander Ark (b. 27 December, 1957) is a well-known expert on the Harry Potter series. He is the founder and webmaster of the Harry Potter Lexicon website and author of The Lexicon: An Unauthorized Guide to Harry Potter Fiction and Related Materials and In Search of Harry Potter.
Vander Ark contributes with presentations and keynotes at major academic conferences, including Sectus in London, Patronus in Copenhagen, Lumos in Las Vegas, Prophecy in Toronto, and Azkatraz in San Francisco, with his lecture series: Exploring the Wizarding World, Miracles and Mysteries and Herbology.[1][2]
Steve Vander Ark also has his own Pottermore account, ProphecyFrog181, and was Sorted into Ravenclaw.[2][3]