When Dr. Michael Newton, a certified Master Hypnotherapist, began regressing his clients back in time to access their memories of former lives, he stumbled onto a discovery of enormous proportions: that it is possible to see into the spirit world through the mind's eye of subjects who are in a hypnotized or superconscious state, and that clients in this altered state were able to tell him what their soul was doing between lives on Earth.

His first book, Journey of Souls, presents ten years of his research and insights to help people understand the purpose behind their life choices, and how and why our soul - and the souls of those we love - lives eternally. His follow-up book, Destiny of Souls, is also highly recommended.  In May of 2004, Dr. Newton's new book entitled Life Between Lives: Hypnotherapy for Spiritual Regression was released. Dr. Newton is also the founder of 'The Society for Spiritual Regression'.
http://www.2012changesarenow.com/2009/07/journey-of-souls-phd-dr-michael-newton.html

Journey of Souls
Case Studies of Life Between Lives.  While in deep hypnosis, 29 patients of the author describe their hidden memories of the hereafter, including what has happened to them between their former reincarnations on earth. They reveal how it feels to die, who meets us after death, and what the spirit world is like.

Destiny of Souls
Hypnotherapist Dr Michael Newton asks his patients to describe their lives from the moment of death right up until reincarnation into this world. Newton now takes us back for a second trip, going into infinitely more detail. Of therapeutic interest is how spirits contact the living to help loved ones they've left behind deal with their grief. Newton assures readers that they will reconnect with those who have gone before them, even their pets. Newton documents the full range of questions one could ever think of to ask about life after death. How can a soul be in heaven and reincarnate at the same time? How are new souls created? How are souls who've done evil on earth punished? These and many other questions are answered with surprising congruity between respondents.