Team of Radiation Experts


David Hornback, M.D., completed his Radiation Oncology residency from Indiana University in 1992. Previously, Dr. Hornback completed his internship from St. Vincent Hospital, Indianapolis in 1989 and graduated from Indiana University School of Medicine in 1988. Dr. Hornback is very active in clinical research, serving as the principal investigator for local RTOG studies as well as a member of the board of directors for the Northern Indiana Cancer Research Consortium. His special interests include breast, prostate and colorectal cancer and brachtherapy treatment procedures. Dr. Hornback is specially trained in both low dose permanent and high dose rate temporary prostate seed implants and has successfully completed more than 200 cases at Memorial Hospital. Dr. Hornback has been practicing in Northern Indiana since 1992 and is the Medical Director of Memorial's Radiation Oncology Center. He remains committed to the community, participating in a number of cancer screening events, speaking at numerous events to help educate both physicians and patients, and as a member of the Board of Directors for the Memorial Health Foundation.


Samuel McGrath, M.D., is a board-certified radiation oncologist who has been practicing at Memorial Hospital of South Bend since 2010. He completed his internship and residency at William Beaumont Hospital in Royal Oak, Mich. While at William Beaumont, Dr. McGrath had the opportunity to train under several nationally renowned radiation oncologists, acquiring valuable experience with advanced treatment planning and delivery techniques, including radiosurgery, brachytherapy and IMRT/IGRT. He received his medical degree from Wayne State University School of Medicine in Detroit, graduating with highest distinction as a member of the Alpha Omega Alpha national medical honor society. Prior to this, he completed his bachelor’s degree in chemistry at Indiana University, Bloomington, where he graduated summa cum laude and as a member of the Phi Beta Kappa honor society. Dr. McGrath has published on a variety of topics, including prostate, breast and lung cancer. He is an active member of the American Society of Therapeutic Radiology and Oncology and treats all solid tumors at both the South Bend and Mishawaka offices.

ReidThomas J. Reid III, M.D., Ph.D., FACP, serves as Medical Director of the Memorial Regional Cancer Center, where he joined the team in 2013. Dr. Reid specializes in Hematology-Medical Oncology. He earned his Bachelor's of Science in Microbiology at The Pennsylvania State University and his Ph.D. in Biochemistry at Purdue University. Dr. Reid earned his medical degree at the Uniformed Services University of the Health Sciences in Bethesda, Md. He completed his internship and residency in Internal Medicine and fellowship in Hematology-Medical Oncology at the Walter Reed Army Medical Center, Washington, D.C. Dr. Reid served 27 years in the Army Medical Corps, retiring in 2008 as a full Colonel. Dr. Reid's clinical interests include cancer clinical trials, epidemiology, cancer genetics, cancer survivorship, patient education, coagulation and hematologic disorders.


Radiation Therapists

Radiation TherapistsRadiation therapists work with radiation oncologists to simulate and deliver the daily radiation treatments. They maintain accurate daily records of each therapy and perform daily quality assurance checks on the linear accelerators. Memorial Radiation Therapists are all nationally certified through the American Registry of Radiologic Technologists and licensed in the state of Indiana.


PhysicistsMemorial's Radiation Physicists oversee the work of the dosimetrist and help ensure that complex treatments are properly planned and delivered to each patient. Our physicists are responsible for developing and directing quality control programs for equipment and procedures. They are responsible for ensuring the equipment works properly. On a routine basis, our physicists precisely measure and study the radiation beam's characteristics to verify accuracy and safety. 


DosimitristsWorking under the direction of the Radiation Oncologist, Dosimetrists carefully develop each patient's unique treatment plan. They develop plans that can best destroy the tumor while sparing the normal, healthy tissues. Many of these treatment plans are very complex. Dosimetrists work with the doctor and the medical physicist to choose the treatment plan that is just right for each patient. Memorial's dosimetrists are Certified Medical Dosimetrists.


NursesRadiation Oncology nurses work with the radiation team to care for patients during the course of treatment. They help evaluate the patient before treatment begins. They educate each patient about potential side effects and their management. During the course of radiation treatments, patients may be evaluated weekly, or more frequently by the nurse to assess problems and concerns.

Support Staff

Front office, transcription and billing staff all play crucial roles in providing outstanding patient care. The tremendous contributions of these Team Members are appreciated by all.

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