Dr. Peter Orris, a founding member of PNHP, is a professor and senior physician (former chief) of occupational and environmental medicine for the University of Illinois Hospital and Health Sciences System. He has been an attending physician in the Division of Occupational Medicine at the Stroger Hospital of Cook County for over three decades, where he practiced and taught internal and occupational medicine. Dr. Orris maintains an active clinical and teaching practice and holds professorships in internal and preventive medicine at Rush University Medical College and the Northwestern University Feinberg School of Medicine. His research and teaching have focused on international health care systems, occupational and community effects of toxic chemicals, and sustainable health care and climate change.

Dr. Orris has served as an adviser to many organizations, including the World Health Organization, Pan American Health Organization, World Medical Association, World Federation of Public Health Associations, and Health Care Without Harm.

Dr. Orris earned his undergraduate degree from Harvard College, his masters in public health at Yale, and his medical degree from the Chicago Medical School of Rosalind Franklin University. He is a Fellow of the ACP and ACOEM as well as a member of AOA, and an active member of the American Public Health Association, while also serving on the Council of the Chicago Medical Society and as a delegate to the Illinois State Medical Society.