Professor Doctor Gerhard W. Hacker is a specialist in endocrinological pathology. Since 1995 he has been head of the Research Institute for Frontier Questions of Medicine and Biotechnology at the Federal Hospital of Salzburg.

Ursula Demarmels-Hacker has worked for many years as a freelance past-life regression expert and seminar leader. She is a lecturer at the University of Salzburg in relaxation and hypnotic techniques, stress management, and motivation training. She is a member of the Michael Newton Institute for Life Between Lives Hypnotherapy in the USA and the European Association for Regression Therapy (EARTh). She is well known through many television appearances and articles in the press.