Ethel Derby Weld, M.D., Ph.D.

Headshot of Ethel Derby Weld
  • Assistant Professor of Medicine

Languages: English, French, Mandarin, Spanish


Dr. Ethel D. Weld is an assistant professor of medicine at the Johns Hopkins University School of Medicine. Her area of expertise is clinical pharmacology.

Dr. Weld received her B.A. from New York University and earned her M.D. from the University of Chicago Pritzker School of Medicine/Biological Sciences. She completed a fellowship in clinical pharmacology and infectious diseases at Johns Hopkins.

She joined the Johns Hopkins faculty in 2016. more


  • Assistant Professor of Medicine
  • Assistant Professor of Pharmacology and Molecular Sciences

Departments / Divisions



  • MD; Medicine; University of Chicago Pritzker School of Medicine (2006)


  • Medicine and Pediatrics; University of Maryland Medical Center (2010)


  • Infectious Diseases; Johns Hopkins University School of Medicine (2016)

Board Certifications

  • American Board of Internal Medicine (Infectious Disease) (2014)
  • American Board of Internal Medicine (Internal Medicine) (2011)

Research & Publications

Research Summary

Dr. Ethel Weld is an internist-pediatrician specializing in clinical pharmacology and infectious diseases. She is strongly committed to patient-oriented clinical investigation within academic medicine. Her current research program and long-term career goals within clinical research include contributing to the existing body of knowledge about clinical pharmacologic aspects of the prevention and treatment of HIV and treatment of multidrug-resistant tuberculosis. Her strong interest is in the development of novel drug delivery strategies that are broadly acceptable, less toxic to patients, implementable for programs and do not require daily pills, including nanoformulated, parenteral, long-acting antiretrovirals and microbicides. She is also interested in seeking treatment and prevention strategies that are behaviorally congruent and do not require patients to deviate significantly from existing behaviors. Dr. Weld is interested in such strategies primarily as a method to optimize adherence to treatment and preventive regimens, as adherence is the well-documented Achilles’ heel of any prevention or treatment intervention.

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.

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