Dr. phil. iDr. phil. Christina Koller is a qualified social worker and did her doctorate from 2000-2007 on the curriculum development of Peter Hess® Sound Education and its practice. For more than 20 years she has worked closely with Peter Hess, and at the PHI in the departments of press and public relations, as well as research and development. In addition she is a board member of the European Association for Sound Massage Therapy.