Dr. Erin Yuet Tjam, PhD, has had a rich career over the last thirty years. She has been a health educator, adjunct professor, entrepreneur, and Special Advisor to the President at the University of Waterloo. She was also Director of Research at St. Mary's General Hospital and Health Researcher at St. Joseph's Health Care System, in Ontario, Canada. Erin established two successful businesses while managing a vibrant household of six kids and two grandparents. Now that the kids are grown and the businesses are self-sufficient, she devotes her time to researching and writing about health and beauty. Erin has been obsessed with skin for over four decades. Dr. Ryuichi Utsugi, MD, is a specialist in anti-aging and skin health, and a board-certified plastic surgeon for over forty years. He founded the Aesthetic Medicine Center of the Research Institute of Kitasato University Hospital and is the Director of Clinic UTSUGIryu in Tokyo, Japan. He was an expert advisor to skincare companies and had his own line of skincare products before he discovered what they do to the skin. He presented and published this research in conferences, scientific papers, medical textbooks, and skin health books. One of his books, translated in Chinese as Skin Fasting, remains popular across Asia a decade after publication in Japan.