Bill Landreth

William "Bill" Landreth (born 1964) is an American hacker notable for his cracking activities during the early 1980s within an exclusive cracking club called "The Inner Circle", and subsequent 1986 disappearance (from which he re-appeared a year later). His book Out of the Inner Circle: A Hacker's Guide to Computer Security, published in 1986, is considered a best-seller.