Joseph R. Berger (born April 19, 1951) is an American internist and neurologist who is known[1][non-primary source needed][2][non-primary source needed] for his research interests in progressive multifocal leukoencephalopathy (PML), the neurological complications of HIV/AIDS, multiple sclerosis, and other inflammatory disorders of the brain.
From 1995 through 2014, he was chairman of the Department of Neurology at the University of Kentucky College of Medicine, where he held the Ruth L. Works Professorship and was director of the Multiple Sclerosis Clinic and the Neuro-AIDS Program.
Berger worked in international outreach programs- as he ran a conference for the United Nations and Mother and Children's African Relief Organization in Addis Ababa, Ethiopia in 1999.
In 2014, he joined the faculty of the Perelman School of Medicine, University of Pennsylvania, as professor of neurology and was chief of the Multiple Sclerosis Division from 2014 through 2019.
Berger has published more than 275 refereed papers, more than 100 chapters, and has co-edited four textbooks, The preponderance of his published work has focused on the progressive multifocal leukoencephalopathy, the neurological complications of HIV/AIDS and other infectious diseases, and multiple sclerosis and related inflammatory conditions; however, his contributions address a large number of other neurological conditions.