Health Services Research
![Su-Hsin Chang, PhD](https://publichealth.wustl.edu/files/2015/05/Su-hsin-Chang_2019_F5A0173-280x386-1.jpg)
Su-Hsin Chang, PhD
Associate Professor of Surgery, Division of Public Health Sciences, School of Medicine
- Email: chang.su-hsin@wustl.edu
![Kenton J. Johnston, PhD, MPH](https://publichealth.wustl.edu/files/2023/01/Kenton-Johnston-Professional-Head-Shot-280x386.jpg)
Kenton J. Johnston, PhD, MPH
Associate Director for Research, Center for Advancing Health Services, Policy & Economics Research
- Email: johnstonkj@wustl.edu
Additional titles: Associate Professor, School of Medicine; Director, Medicare Innovation Research Lab
![Jing Li, MD, DrPH, MS](https://publichealth.wustl.edu/files/2022/12/Li_Jing-2-280x386.jpg)
Jing Li, MD, DrPH, MS
Associate Professor of Medicine, Division of General Medicine & Geriatrics, School of Medicine
![Kevin Y. Xu, MD, MPH](https://publichealth.wustl.edu/files/2023/12/Kevin-Xu-headshot-280x386.png)
Kevin Y. Xu, MD, MPH
Instructor in Psychiatry, School of Medicine
- Email: xukeviny@wustl.edu
Additional titles: Co-Director, PGY2 Substance Use Disorders Rotation