Jonathan Mark Zenilman, M.D.

Headshot of Jonathan Mark Zenilman
  • Professor of Medicine

Languages: English, Hebrew, Spanish


Infectious Disease, Infectious Diseases, Sexually Transmitted Diseases more

Request an Appointment

Insurance Information

Main Phone

Outside of Maryland & Washington D.C.

Request Appointment

International Patients

Request Appointment


The Johns Hopkins Hospital (Main Entrance)

Appointment Phone: 410-550-9080
1800 Orleans St.
Sheikh Zayed Tower
Baltimore, MD 21287 map

Johns Hopkins Bayview Medical Center

Appointment Phone: 410-550-0501
5200 Eastern Avenue
Mason F. Lord Building, Center Tower, Infectious Diseases, # 381
Baltimore, MD 21224 map
Phone: 410-550-9080


Dr. Jonathan M. Zenilman is a professor of medicine,  at the Johns Hopkins University School of Medicine. He also has as joint appointments in population family and reproductive health, international health and epidemiology at the Johns Hopkins University Bloomberg School of Public Health.

Dr. Zenilman is known internationally for his work in infectious disease epidemiology. Prior to coming to Johns Hopkins in 1989, he was a medical epidemiologist at the U.S. Centers for Disease Control (CDC) where he conceived, developed and implemented the National Gonococcal Isolate Surveillance Program (GISP). GISP operated continuously since 1987, and has been responsible for identifying multiple types of resistant strains before they became large clinical problems. He also coordinated and wrote the 1989 STD Treatment Guidelines.

In Baltimore, his activities have included directing the Baltimore City Health Department Sexually Transmitted Infection (STI) program and developing the Johns Hopkins Center for STI Prevention and Training. He was one of the first to apply GIS technology to public health, and his syphilis-mapping project was highlighted in Malcolm Gladwell’s The Tipping Point. In addition to being a productive researcher and clinician, he has been active in health policy, has served as a Senior Medical Advisor for the Office of the Assistant Secretary for Planning and Evaluation (DHHS) 1995-1997, has testified before Congress and the Maryland legislature on infectious diseases related issues.

From 2003-19 he was chief of the Division of Infectious Diseases at Johns Hopkins Bayview Medical Center in 2003 where he implemented major clinical and research programs in STIs, hospital epidemiology, antibiotic stewardship and skin and soft tissue infections. 

Dr. Zenilman has >350 publications and is an active teacher, mentoring more than 40 fellows and residents during his career.

He received his B.A. from Cornell University in chemistry and earned his M.D. from State University of New York (SUNY)-Downstate in Brooklyn, NY. He trained at SUNY-Kings County Hospital in internal medicine and did his infectious diseases fellowship at Emory University in Atlanta. He is a fellow of the American College of Physicians and of the Infectious Diseases Society of America. more


  • Professor of Medicine
  • Professor of Dermatology
  • Professor of Gynecology and Obstetrics

Departments / Divisions

Centers & Institutes



  • MD; Medicine; SUNY Downstate Medical Center (1981)


  • Infectious Diseases; Emory University School of Medicine (1988)
  • Infectious Diseases; Kings County Hospital Center/SUNY Downstate (1985)

Board Certifications

  • American Board of Internal Medicine (Infectious Disease) (1988)
  • American Board of Internal Medicine (Internal Medicine) (1984)

Activities & Honors


  • Distinguished Career Award, American Sexually Transmitted Diseases Association , 2013
  • Co-recipiet, CDC Charles C. Shepard Science Award, CDC, 1999
  • Scholar Award, American Foundation for AIDS Research (AmFAR) , 1992 - 1995
  • Unit Citation, U.S. Public Health Service , 1990
  • Commendation Medal, U.S. Public Health Service , 1988


  • American College of Physicians
  • American Sexually Transmitted Diseases Association
  • American Society for Microbiology
  • British Association for Sexual Health and HIV
  • Infectious Disease Society of America

Professional Activities

  • President, American STD Association

Patient Ratings & Comments

The Patient Rating score is an average of all responses to physician related questions on the national CG-CAHPS Medical Practice patient experience survey through Press Ganey. Responses are measured on a scale of 1 to 5, with 5 being the best score. Comments are also gathered from our CG-CAHPS Medical Practice Survey through Press Ganey and displayed in their entirety. Patients are de-identified for confidentiality and patient privacy.

Is this you? Edit Profile
back to top button