Dr. Simmons is the Director of the Sadler Clinic Sleep Disorders Center with locations in The Woodlands and Conroe, Texas, and Director of Comprehensive Sleep Medicine Associates (CSMA), with locations in the Houston Medical Center and Sugar Land Texas. He founded and directs the Sleep Education Consortium, a non-profit organization focused on enhancing the education of other doctors and health care professionals. As a Neurologist, Dr. Simmons treats patients with a wide range of neurological conditions but he spends most of his practice evaluating and treating patients with sleep disorders such as Snoring and Sleep Apnea, Restless Legs syndrome (RLS), Insomnia, and Excessive Daytime Sleepiness (EDS). He has been on the cutting edge of implementing new technologies in the sleep laboratory, including esophageal pressure monitoring to diagnose patients with the Upper Airway Resistance Syndrome. Dr. Simmons evaluates pediatric patients as well as adults, and is amongst the few sleep specialists in the United States who can competently diagnose children who have Hyper Activity Attention Deficit Disorder caused by a subtle sleep disturbance such as the Upper Airway resistance Syndrome or Period Leg Movements of Sleep. Doctor Simmons is committed to educating medical professionals and the general public on sleep and sleep disorders. As the Director of the Sleep Education Consortium Dr. Simmons coordinates ongoing conferences to enhance the knowledge of sleep disorders of primary care physicians so they can better serve their patients.