John Han-Chih Chang, MD


Speciality: Radiation Oncology

I chose Oklahoma Proton Center Because...

Radiation oncology is a treatment people in Oklahoma and the southwest cannot be without. Radiation centers like Oklahoma Proton Center provide the appropriate patients with the best possible cancer treatments.

About me

When I was in 8th grade, my grandfather passed away from very advanced lymphoma despite the very best treatment at one of the best cancer centers in America. I vowed to make a difference. In college, I initially chose the path of a researcher working in laboratories looking for treatments to combat bladder and breast cancers. I began work with a radiation oncology resident who was doing his research year in the lab, and he convinced me to join him for a day in his clinic. The technology of radiation oncology was in its rapid growth phase at the time and I was hooked. I realized I could pair my passion for helping cancer patients with my love of technological advances.That launched my drive to be a physician and more specifically a radiation oncologist.


Hospital at the University of Pennsylvania, 1996 - 2000

Medical School

University of Michigan Medical School, 1987-1991

Board Certifications

2018 – Present Tennessee Medical License 57231 2000 – Present Illinois Medical License 036-102262 2010 – 2011 Oklahoma Medical License 27477 1997 – 2000 Pennsylvania Medical License MD064357L 1995 – 1996 Michigan Medical License 4301065362 2010 – Present American College of Radiology – Radiation Oncology Board Recertification 2000 – 2010 American College of Radiology – Radiation Oncology Board Certification

Back to clinical team