Faculty by division
![William Brinson Orr, MD, FAAP, FACC](https://pediatrics.wustl.edu/app/uploads/2021/12/William-Orr-280x386-1-280x386.jpeg)
William Brinson Orr, MD, FAAP, FACC
Assistant Professor of Pediatrics, Cardiology
Director, Pediatric Exercise Physiology Lab
Associate Director, Pediatric Cardiology Fellowship
- Phone: 314-454-6095
![Rachel C. Orscheln, MD](https://pediatrics.wustl.edu/app/uploads/2022/08/Orscheln-Rachel_Peds300_-04-280x386.jpg)
Rachel C. Orscheln, MD
Professor of Pediatrics, Infectious Diseases
Director, Clinical Services
Vice Chair, Community Health and Strategic Planning
- Phone: 314-454-6050
![Cynthia M. Ortinau, MD, MSCI](https://pediatrics.wustl.edu/app/uploads/2021/12/Cynthia-Ortinau-280x386-1-280x386.jpeg)
Cynthia M. Ortinau, MD, MSCI
Assistant Professor of Pediatrics, Newborn Medicine
- Phone: 314-454-2683
![Anthony W. Orvedahl, MD, PhD](https://pediatrics.wustl.edu/app/uploads/2022/08/Orvedahl_white_coat-280x386.jpeg)
Anthony W. Orvedahl, MD, PhD
Assistant Professor of Pediatrics, Infectious Diseases
- Phone: 314-454-6050
![Stephen C. Pak, PhD](https://pediatrics.wustl.edu/app/uploads/2021/12/Stephen-Pak-280x386.jpg)