Donnie Yance, CN, RH (AHG) is a Clinical Master Herbalist and Certified Nutritionist with over thirty years of patient care experience. He is the founder of the Mederi Center, a non-profit integrative oncology practice in Ashland, OR, and the president and formulator of Natura Health Products. Donnie developed the Mederi Care® model — a whole-systems approach that bridges cutting-edge science with the wisdom of traditional healing — and teaches it to practitioners worldwide through Mederi Academy. He is the author of Herbal Medicine, Healing and Cancer and Adaptogens in Medical Herbalism.