Medical Review Board (MRB) Members

Critical areas of medical expertise are highlighted in the summaries of members’ professional experience below. They include:

Medical Toxicology (Medications, Alcohol/Substance Abuse) - Michael Greenberg, MD
Neurology - Matthew Rizzo, MD
Orthopedic Surgery (Musculoskeletal Disease and Injury) - Gunnar Andersson, MD
Occupational Medicine - Kurt Hegmann, MD
Sleep Medicine - Barbara Phillips, MD

Gunnar B.J. Andersson, MD, PhD (Illinois) is the The William A. Hark – Susanne G. Swift Professor and Chairman of the Department of Orthopedic Surgery at Rush University Medical Center, Chicago, Illinois. During his tenure as Chairman he has also been President of the Medical Staff, Vice Dean for Surgical Sciences and Services, and Senior Vice President of Medical Affairs, each for two-year periods. He is board certified in Orthopedic Surgery (musculoskeletal diseases and injuries) both in the United States and in Sweden. Dr. Andersson received his M.D. from the University of Göteborg, Sweden, did his residency at Sahlgren University Hospital and also obtained a Ph.D. in medical science at the University of Göteborg in 1974. After a fellowship at the London Hospital he joined the faculty at the University of Göteborg for 10 years. In 1985 he moved to the United States and Rush University Medical Center. His clinical area of interest is spine, while his research interests are disc degeneration, epidemiology and occupational biomechanics. Dr. Andersson is a past President of the Orthopaedic Research Society, the International Society for the Study of the Lumbar Spine and the American Academy of Disability Evaluating Physicians. He has been a council member of the National Institutes of Arthritis and Musculoskeletal and Skin Diseases at NIH, Chairman of the Research Committee at the American Academy of Orthopaedic Surgeons, and a member of three Institute of Medicine committees. He is a member of 15 Editorial Boards, a Deputy Editor for Spine, Editor-in-Chief of Contemporary Spine Surgery and an Associate Editor of Clinical Biomechanics. He is the author of more than 250 original publications, more than 150 books and book chapters and 430 abstracts. He was the Senior Editor of the 5th Edition of the AMA Guides to the Evaluation of Permanent Impairment.

Michael Greenberg, MD, MPH (Pennsylvania) is Tenured Professor of Emergency Medicine and Professor of Public Health at the Drexel University College of Medicine (DUCOM) in Philadelphia and Clinical Professor of Emergency Medicine at Temple University School of Medicine. He is the Program Director for the Medical Toxicology Fellowship Training Program at DUCOM where he also serves as the Chief of the Division of Occupational and Environmental Emergency Medicine and the Associate Director of the Division of Medical Toxicology. Dr. Greenberg holds current board certifications in three specialties: Medical Toxicology, Preventive Medicine (Occupational/Environmental Medicine), and Emergency Medicine. He has been elected to Fellow status in the American College of Preventive Medicine, the American Academy of Emergency Medicine and the American College of Occupational and Environmental Medicine. His primary clinical practice involves medical, occupational, and environmental toxicology and he serves as a clinical consultant for the Philadelphia Poison Control Center (since 1994). Dr. Greenberg is the Editor-in-Chief of Occupational, Industrial, and Environmental Toxicology, published by Harcourt Health Sciences, as well as Greenberg's Atlas of Emergency Medicine, published by Lippincott, Williams and Wilkins of Philadelphia. He is the author of more than 250 scientific articles, abstracts, and book chapters. Dr. Greenberg has served as an instructor in the Department of Defense Domestic Preparedness Program and as a consultant on chemical and biological weapons of mass destruction to the U.S. State Department’s Bureau of Diplomatic Security and the U.S. Navy’s Office of Homeland Defense. In addition, he has served as principal investigator for several research projects funded by the U.S. Army that deal with hospital preparedness against weapons that might be used by terrorists. Dr. Greenberg has served on the American College of Medical Toxicology (ACMT) committee to examine the use of potassium iodide in radiological emergencies and he is currently the Chair of the Biomonitoring Committee for ACMT. He is an elected member of the Board of Trustees of the American Academy of Clinical Toxicology and a charter member of the American Academy of Emergency Medicine. Dr. Greenberg has recently been elected President Elect of the American Academy of Clinical Toxicology (AACT), the largest organization of clinical toxicologists in the world. Dr. Greenberg served as a Medical Officer with the U.S. Marine Corps Reserve while serving in the U.S. Naval Reserve from 1985 to 1995 and served on active duty during Operation Desert Storm.

Kurt Hegmann, MD, MPH (Utah, standing member) is Center Director and Associate Professor of Rocky Mountain Center for Occupational and Environmental Health, Department of Family and Preventive Medicine at the University of Utah. He is board certified in Internal Medicine and Occupational Medicine. Dr. Hegmann has written papers about CMV driver medical certification, upper limb musculoskeletal disorders, low back pain, and other musculoskeletal disorders. He has written three textbook chapters on commercial driver medical examinations. He has received research grants from private sector companies as well as the Centers for Disease Control and Prevention (National Institute for Occupational Safety and Health—NIOSH). He chairs the American College of Occupational and Environmental Medicine's Evidence-Based Practice Committee. Dr. Hegmann was nominated by the American College of Occupational and Environmental Medicine.

Barbara Phillips, MD, MSPH (Kentucky) is immediate Past Chair of the National Sleep Foundation and directs the Sleep Medicine program at the University of Kentucky Good Samaritan Hospital in Lexington, KY. She is board certified in Internal Medicine, Pulmonary Disease, Critical Care Medicine, and Sleep Medicine. She is a professor at the University of Kentucky College of Medicine. Dr. Phillips has been a medical consultant for the National Aeronautics and Space Administration, RAND Corporation, U.S. Department of Health and Human Services, National Institutes of Health, and other government agencies. She has served on the Boards of the American Lung Association, the American Academy of Sleep Medicine, the American Board of Sleep Medicine, and the Medical Advisory Board of the National Center on Sleep Disorders Research. She currently serves on the Sleep Institute and the Board of Regents of the American College of Chest Physicians. She has led research studies in areas such as obesity, epidemiology of restless leg syndrome and sleep-disordered breathing, alternative treatments for obstructive sleep apnea, sleep-disordered breathing in the elderly, attention deficit disorder and sleep, and sleep loss among physicians in training. She has lectured and presented nationally and internationally on sleep disorders. Dr. Phillips was nominated by the National Sleep Foundation and the American College of Chest Physicians.

Matthew Rizzo, MD (Johns Hopkins) is Professor of Neurology, Mechanical and Industrial Engineering, and Public Policy at the University of Iowa. He is Director of the Division of Neuroergonomics and its laboratories and Vice Chair of Translational Research in the Department of Neurology. Dr. Rizzo’s expertise and research include aging, visual and cognitive neuroscience, human factors and ergonomics, driving simulation, and instrumented vehicles. The National Institutes of Health and the Centers for Disease Control and Prevention have supported this research. Dr. Rizzo has advised the American Association of Motor Vehicle Administrators, National Highway Traffic Safety Administration (NHTSA), American Academy of Neurology (AAN), Iowa Department of Transportation, as well as the governments of Australia, Canada, and Sweden on issues relating to licensing of drivers whose medical disorders put them at risk for driving impairments, errors, and crashes. Dr. Rizzo was also a panel member for the 1988 Conference on Neurological Disorders and Commercial Drivers.