H. Thomas Johnson, MD, is board-certified in sleep medicine and family medicine. He works as a pediatric and adult sleep specialist. He is affiliated with SSM Health Cardinal Glennon Children's Hospital, and SSM Health St. Joseph Hospital - St. Charles. Dr. Johnson is also the director of the pediatric sleep center at SSM Health St. Joseph Hospital - St. Charles.

Dr. Johnson has been in practice in the St. Louis area since 2007. He graduated from the University of Missouri-Columbia with his medical degree and completed his residency at St. Vincent's HealthCare in Jacksonville, Fla. After completing his residency, Dr. Johnson practiced family medicine for five years. He then went on to complete a fellowship in sleep medicine at Saint Louis University before joining SSM Health. Dr. Johnson has also served as the President of the Missouri Sleep Society and is involved in the American Academy of Sleep Medicine.