ROBERT A. GREENE, M.D., is the medical director of the Sher Institute for Reproductive Medicine in California, and he is one of the country’s leading hormone specialists and a practicing ob/gyn. A world-renowned brain researcher, he gives about 75 lectures a year to the worldwide medical community. His articles linking hormone depletion to brain health and quality of life have appeared in many major medical journals.

LAURIE TARKAN is an award-winning medical writer with more than twenty years of journalism and writing experience. She is the author of My Mother’s Breast: Daughters Face Their Mothers’ Cancer, writes about health issues for the New York Times, and has written for magazines, including Self, Child, Fit Pregnancy, Family Circle, and Health.