Dr. Gray holds a medical degree from the Johns Hopkins University School of Medicine and completed his residency training in the Harvard Radiation Oncology Program. Currently he serves as Assistant Professor of Radiation Oncology at Harvard Medical School and the Massachusetts General Hospital and is board certified in Radiation Oncology by the American Board of Radiology. His clinical practice focuses on the treatment of patients with genitourinary malignancies, specifically prostate, bladder, testicular, ureteral, urethral, renal and penile cancers. His clinical activities include treatment of patients with photon radiotherapy, brachytherapy and proton therapy. Dr. Gray's research interests include clinical, translational and health services research. Several recent projects include studies aimed at understanding practice patterns in genitourinary cancers in the United States and the comparative effectiveness of treatment options available for patients with prostate and bladder cancers. Additional research has focused on the comparative effectiveness of proton therapy vs. intensity-modulated radiation therapy for prostate cancer and Dr. Gray is a co-investigator on a multi-center randomized trial on this topic. Dr. Gray is also conducting a randomized controlled trial investigating the utility of a web-based decision aid for patients with low-risk prostate cancer. His translational research efforts currently focus on validating biomarkers of radiation response in bladder cancer in cooperation with NRG Oncology. Dr. Gray also has a strong interest in global Oncology and has participated in outreach efforts in both Botswana and China. He travels to China frequently to engage in educational seminars and is currently participating in several collaborative research projects including the development of international clinical trials.