"My philosophy, when it comes to treating patients, is not just treating the medical illness, but also treating their psychological, emotional, and spiritual needs, because I think they are all tied together."Lucas M. Duvall, MD, FACS is a board-certified and fellowship trained cardio-thoracic surgeon and a fellow in the American College of Surgeons.Â Dr. Duvall is the Houston Methodist The Woodlands Hospital Cardiovascular Surgery Medical Director and the Vice President of the Medical Staff.