Heiner Frei was born and lives in Switzerland. After graduating from medical school in 1977, he specialized in Pediatrics and served for several years as Head Physician in Pediatric Hematology and Oncology at the University Children’s Hospital of Bern. In 1987, he began his own private practice and training in homeopathy, and was president of the Swiss Association of Homeopathic Physicians from 2001 to 2005. Dr. Frei’s homeopathic research activities focus on clinical studies about acute ENT diseases, ADD/ADHD, H1N1-Influenza, and the treatment of multi-morbid patients. He was study coordinator of the rigorous Swiss double blind study on the homeopathic treatment of ADHD, which yielded scientific evidence for a specific effect of homeopathic medicines. In 2001, Dr. Frei developed “Polarity Analysis”, a new approach to improve the precision of homeopathic prescriptions, and has published numerous articles on the subject. He teaches homeopathy in Europe, India, and the United States, and has written four books on different aspects of Polarity Analysis and ADD/ADHD, including “Polarity Analysis in Homeopathy” and “Homeopathy and ADHD.” He has received several research awards for his scientific work. His latest work is Polarity Analysis software, a repertory with symptoms divided into three reliability classes, which allow for even more precise prescriptions.