Dr. Michael Newton (1931-2016) discovered that some patients under deep hypnosis were able to access memories of their time in the spirit world. However, he waited until he had collected 7,000 case studies over 25 years before sharing the information with the world. His first book, Journey of Souls (1994), presented ten years of his research and insights to help people understand the purpose behind their life choices. His follow-up book Destiny of Souls (2000) looked at life in the world of spirit, as revealed in 70 new cases.