Sleep medicine specialist Gregory Streff, DO, FCCP, FACOI, is medical director of the sleep lab at Spectrum Health Ludington Hospital. He is board certified in internal medicine, pulmonary medicine, critical care and sleep medicine. Dr. Streff is a fellow of the College of Chest Physicians (FCCP), and a fellow of the American College of Osteopathic Internists (FACOI). He received his medical degree from the Des Moines (Iowa) School of Osteopathic Medicine Health Services. He is the founder of Michigan Lung and Critical Care Specialists, P.C.