Dr. Lasley’s research encompasses two distinct disciplines, the first directed towards women’s healthy aging. He studies the health assessment and management of mid-aged women. He is also involved in the population-based Studies of Women Across the Nation (SWAN). Together, these activities have led to a novel explanation for the rise in adrenal steroids during the menopausal transition and the validation of the nonhuman primate model. The second aspect of his research program focuses on environmental hazards to human reproductive health.