Little is known about Walden’s personal life but Walden has a BA in English Literature, MA in Twentieth Century Literature, Film and Television. Walden has a wife, Sarah, a daughter called Megan and a cat called Marge.

H.I.V.E. (aka. Higher Institute of Villainous Education) is a series of young-adult fiction novels by Mark Walden .H.I.V.E. is a top secret school in which children learn the skills to become criminal masterminds. Only children who have already been noticed having some villainous skill are accepted to this school. Otto Malpense is a thirteen year old criminal genius,who has been handpicked along with others-the smartest, most athletic, technologically advanced kids in the world to be part of H.I.V.E. But once Otto has entered the school, he discovers that is it not all what it seems, and sets out to unfold the mystery behind the school and its organization.