Even in this time of uncertainty, Mayo Clinic is a place for hope and healing — and we're committed to delivering the care you need. With options for face-to-face, virtual visits or phone appointments in adherence with federal and state executive orders and guidance. Christopher L. Hallemeier, M.D., is a radiation oncologist at Mayo Clinic's campus in Rochester, Minnesota. His specialties include anal cancer, colon cancer, esophageal cancer, liver cancer, pancreatic cancer, rectal cancer and stomach cancer. In addition, Dr. Hallemeier's interests and specialties include 3D conformal radiotherapy, IMRT, proton therapy and stereotactic body radiotherapy. U.S. News & World Report consistently ranks Mayo Clinic among the top hospitals for cancer in the nation.