Dr. Joshua Garren completed his medical education at Brown University and Harvard University. He is certified by the American Board of Radiology. He has been voted one of Oklahoma’s Top Doctors by Oklahoma Magazine, Boston’s Top Doctors by Castle Connolly, and America’s Top Doctors by US News and World Report. He is chief radiation oncologist for Landmark Cancer Centers.

Dr. Garren has served as assistant clinical professor at Tufts School of Medicine and as an assistant clinical instructor at the State University of New York. He is active in clinical research minimizing treatment toxicity. He has held memberships in the Society for Neurological Oncology, the American Medical Association, and the American Society for Therapeutic Radiation Oncology, and served on the board of the New York Roentgen Society.

Dr. Garren has worked with Doctors of the World, and won an Albert Schweizer Fellowship to work in Africa. He is a man of faith and the father of five children.


Residency in Radiation Oncology, SUNY

Fellowship in Neurosurgery, NYU Medical Center


Harvard University, MD/MPH program

Brown University, MD/ PhD program

Rockefeller University, Cold Spring Harbor Laboratories

Brown University, MA neuroscience

Brown University, BA international relations

Licensures and Certifications

American Board of Radiology


Tulsa Cancer Center