How To Develop Your ESP is a 20-minute audio training course. Extrasensory perception (ESP), often includes psychic abilities such as intuition, telepathy, clairvoyance, and the study of the paranormal. This recording is narrated by Hans Holzer (Jan. 26, 1920 - April 26, 2009), an American paranormal researcher and author who wrote more than 120 books on supernatural and occult subjects during his lifetime. Holzer's most famous paranormal investigation was into the late 1970s Amityville Horror case.