The Plum Spring Clinic Difference. Our wellness center medical director, Dr. Michael Sharp, is a Harvard trained physician who served on the faculty of the UNC School of Medicine for 20 years before a growing dissatisfaction with the practice of mainstream medicine and his brush with serious illness led him to look outside the box.Conditions We Treat‧Become a New Patient‧About‧Blog‧Contact‧Stress and Mood Disorders.