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He is Board Member of the American Botanical Council (ABC) and editor and editorial board member of 7 scientific journals, e.g. „Phytomedicine“. He has worked as advisor to the Office of Dietary Supplements at the U.S. National Institutes of Health, was chairman of the American Herbal Products Association’s International Committee and member of the Council for Responsible Nutrition’s Botanical/Quality Standards Committee. He regularly serves as Chairman and speaker at international conferences like Vitafoods, Health Ingredients, Food Ingredients etc.