The psychologist Gary Schwartz created a series of tests for John and other mediums to complete. In his book, 'The Afterlife Experiments', he stated his belief that Edward had genuine abilities.
- One Last Time: A Psychic Medium Speaks to Those We Have Loved and Lost (1998)
- What If God Were the Sun? (2000)
- Crossing Over: The Stories Behind the Stories (2001)
- After Life: Answers From the Other Side (2003)
- Final Beginnings: The Tunnel (2004)
- Practical Praying: Using the Rosary to Enhance Your Life (2005)