Petros C. Karakousis, MD is a Professor of Medicine at the Johns Hopkins University School of Medicine with joint appointments in International Health and Molecular Microbiology & Immunology at the Johns Hopkins Bloomberg School of Public Health. Petros began the History of Medicine online MA program in January 2021. He is a physician-scientist with a long-standing interest in infectious diseases, medical history, and the social dimensions of medicine.

Petros graduated summa cum laude from Johns Hopkins University in 1994, received a Distinguished Alumni Scholarship to attend Washington University School of Medicine in St. Louis, and was inducted into the Alpha Omega Alpha Honor Society in 1998. He completed his residency in Internal Medicine at the Hospital of the University of Pennsylvania, followed by fellowship training in Infectious Diseases at Johns Hopkins. Since joining the faculty in 2005, he has focused his research and clinical interests on tuberculosis and other mycobacterial diseases. He is the Principal Investigator of the Johns Hopkins University TB Research Advancement Center (TRAC).

In the MA program, his thesis project explores the factors that influenced nurses to work on the Johns Hopkins Hospital Osler 8 inpatient HIV unit in the pre-HAART (Highly Active Antiretroviral Therapy) era.