Dr. Mark G. Hewitt, DBA is a true crime author and award-winning public speaker who travels the world in his quest for intriguing, unanswered questions and enduring mysteries. Mark is the author of the acclaimed Zodiac Serial Killer Series, three books dedicated to telling the complete story of California’s most notorious unidentified serial killer. With inmate Guillermo Mendez, he is the co-author of "Charles Manson Behind Bars," the first Manson book from the inside. Hewitt has earned a BA in Theology, a M.Div. in ministry, and an MBA and a DBA in Business Administration,