Kathryn R. Simpson, MS, was an executive in the biotech industry when she was diagnosed with multiple sclerosis. Research led her to discover that her symptoms were caused by multiple hormonal deficiencies including low thyroid, adrenal, and sex hormone levels. She resolved all of her debilitating symptoms with bio-identical hormone supplementation. Simpson founded a specialty hormone clinic, the Simpson Foundation, to treat hormone imbalance and diseases such as multiple sclerosis, lupus, and fibromyalgia. Today, the Simpson Foundation is dedicated to endocrine research and education. Simpson is author of The Perimenopause and Menopause Workbook and The MS Solution. She lives in Santa Ynez, CA.

Foreword writer Thierry Hertoghe, MD, is a fourth-generation endocrinology expert. His great-grandfather, grandfather, and father were pioneers in early endocrinology and thyroid research. Hertoghe is author of The Hormone Solution and The Hormone Handbook.

Kathryn R. Simpson, MS, was an executive in the biotech industry when she was diagnosed with multiple sclerosis. Upon discovering that her symptoms were caused by multiple hormonal deficiencies, Simpson began conducting endocrine research. She discovered that resolving these hormonal deficiencies led to a complete resolution of all her symptoms. Now, Simpson is founder and director of The Hormone Resource Center, a specialty hormone clinic that treats hormone imbalance and diseases such as multiple sclerosis, lupus, and fibromyalgia. She is author of The Perimenopause and Menopause Workbook and The MS Solution.