Dr. David Leonard practices Endocrinology in Clearwater, FL. Dr. Leonard specializes in preventing, diagnosing, and treating diseases related to hormone imbalance, and the bodys glands in the endocrine system. Endocrinologists are trained and certified to treat a variety of conditions, including menopause, diabetes, infertility, and thyroid disorders, among many others. Dr. Leonard examines patients, determines means of testing, diagnoses, and decides the best treatment methods.