Christopher L. Hallemeier, M.D., is a radiation oncologist at Mayo Clinic in Rochester, Minnesota, specializing in gastrointestinal cancers, including cancers of the esophagus, stomach, liver, pancreas, colon, rectum, and anus. He has expertise in advanced radiation therapies, including intensity-modulated radiation therapy (IMRT), proton therapy, stereotactic body radiotherapy (SBRT), and 3D conformal radiotherapy. Dr. Hallemeier is committed to personalized, multidisciplinary cancer care and is actively involved in clinical research, including clinical trials and proton beam therapy. His goal is to optimize treatment outcomes while preserving quality of life for patients.