Dr. Grewal earned a Bachelor of Arts in Molecular and Cellular Biology from Harvard University, graduating in 2010, before completing a Doctor of Medicine degree at Harvard Medical School in 2015. Following medical school, he completed an internship in Internal Medicine at the University of Pennsylvania from 2015 to 2016 and went on to complete a residency in Radiation Oncology there from 2016 to 2020. During residency, he was elected Chief Resident in both the PGY-4 and PGY-5 years. Dr. Grewal is board certified by both the American Society for Radiation Oncology and the American Society of Clinical Oncology.