The Undiagnosed Diseases Program
The National Institutes of Health (NIH) Undiagnosed Diseases Program (UDP) is part of the Undiagnosed Disease Network (UDN), an NIH Common Fund initiative that focuses on the most puzzling medical cases referred to the NIH Clinical Center in Bethesda, Maryland. It was organized by the National Human Genome Research Institute (NHGRI), the NIH Office of Rare Diseases Research (ORDR) and the NIH Clinical Center.
Undiagnosed Disease Program Staff

William A. Gahl, M.D., Ph.D.
- Director
- NIH Undiagnosed Diseases Program

David Adams, M.D., Ph.D.
- Co-Director
- NIH Undiagnosed Diseases Program

Valerie Maduro
- Translational Laboratory Manager
- NIH Undiagnosed Diseases Program

Camilo Toro, M.D.
- Senior Clinician
- Office of the Scientific Director

Francis Rossignol, M.D.
- Staff Clinician
- NIH Undiagnosed Diseases Program

Donna N. Novacic, M.D.
- Staff Clinician
- NIH Undiagnosed Diseases Program

Elizabeth A. Burke, Ph.D.
- Scientist
- Undiagnosed Diseases Program

Jason R. McFadden
- Postbaccalaureate Fellow
- NIH Undiagnosed Diseases Program

Yan Huang
- NIH Undiagnosed Diseases Program

Marya S. Sabir
- Predoctoral IRTA Fellow
- NIH Undiagnosed Diseases Program

Wiljeen Paul
- Postbaccalaureate Fellow
- NIH Undiagnosed Diseases Program

Christopher B. Song
- Postbaccalaureate Fellow
- NIH Undiagnosed Diseases Program

Zoe M. Wolfenson
- Postbaccalaureate Fellow
- NIH Undiagnosed Diseases Program
Last updated: November 8, 2023