Dr. Steven Marks graduated from the College of Osteopathic Medicine of the Pacific and did his residency at the Good Samaritan Medical Center. Three fellowship programs followed: one at the University of California Irvine, one at the VA Medical Center and one at the Mayo School of Graduate Medical Education. He is board certified in pulmonary disease and sleep medicine. Dr. Marks has been in practice for more than 20 years, being affiliated with the Flagstaff Medical Center and also a member of the American College of Physicians.