For more than four decades, Dr. Zein E. Obagi has reshaped the aesthetics industry by redefining skin health through science-based principles and protocols. In this book, he shares the philosophies, research, and clinical insights that transformed modern dermatology and continue to guide physicians and patients toward lifelong, healthy skin. This volume sets the gold standard not only for plastic surgeons, dermatologists, and cosmetic facial surgeons, but also for skin care professionals worldwide.