Thomas Easley is coauthor of Modern Herbal Medicine and founder of the Eclectic School of Herbal Medicine. He is a clinical herbalist and professional member of the American Herbalists Guild. Easley integrates modern science and the deep and rich tradition of Western herbalism into a unified and systematic approach to health and healing. Easley emphasizes foods as primary medicine and uses intensive diets as well as stress reduction techniques, nutritional supplements, and exercise to help people achieve their health goals. His approach draws on his extensive clinical experience, which spans 14 years of full-time practice and over 10,000 clients.

Steven Horne is a professional member and former president of the American Herbalists Guild and a professional member of the International Iridology Practitioner's Association, having also served on the board of directors of both organizations. He has spoken at numerous conventions and conferences and has helped to start four different herbal companies, giving him extensive practical experience in formulating and manufacturing herbal extracts. Horne maintains a part-time consulting practice, working one-on-one with clients to help them resolve their health problems.