Faculty by division
![Kristine M. Wylie, PhD](https://pediatrics.wustl.edu/app/uploads/2021/04/Kristine-M.-Wylie-PhD-crop-280x386.jpg)
![Todd N. Wylie](https://pediatrics.wustl.edu/app/uploads/2022/08/tn_wylie_GI-280x386.jpg)
Todd N. Wylie
Assistant Professor of Pediatrics, Gastroenterology, Hepatology & Nutrition
- Phone: 314-454-6173
![Xunjun Xiao, PhD](https://pediatrics.wustl.edu/app/uploads/2021/11/Xunjun-Xiao-cropped-280x386.jpeg)
Xunjun Xiao, PhD
Assistant Professor of Pediatrics, Gastroenterology, Hepatology & Nutrition
- Phone: 314-454-6173
![A. Marion Ybarra, MD](https://pediatrics.wustl.edu/app/uploads/2021/12/Aecha-Ybarra-280x386-1-280x386.jpeg)
A. Marion Ybarra, MD
Assistant Professor of Pediatrics, Cardiology
Pediatric Advanced Heart Failure and Transplant
Pediatric Cardio Oncology Program
Director, Comprehensive Fontan Clinic
- Phone: 314-454-6095