Dr. John T. Barrett

William Stokes is a Radiation Oncologist in Atlanta, Georgia. Dr. Stokes has been practicing medicine for over 13 years and is rated as an Advanced provider by MediFind in the treatment of Laryngeal Cancer. His top areas of expertise are Nasopharyngeal Carcinoma, Laryngeal Cancer, Adenoid Cystic Carcinoma, and Throat Cancer.

Diana A. Santiago, MD is a board-certified radiation oncologist, currently practicing and serving as Medical Director of the Piedmont Newnan Hospital Radiation Oncology Clinic. She treats all tumor types, but has a special interest in breast, prostate, lung and head and neck malignancies. Dr. Santiago earned her medical degree from the Medical University of South Carolina in Charleston, SC. She completed her residency in 1996 at the Medical University of South Carolina. She received her board certification in Radiation Oncology in 1997. Dr. Santiago has been practicing medicine and Radiation Oncology for almost 20 years with her medical group, Therapeutic Radiation Oncology, P.C. Dr. Santiago is very active in administration and strategic planning of cancer services throughout the Piedmont System. She currently serves on the Piedmont Centers of Excellence for breast cancer. She is part of the Piedmont creation team that reviews standardization and quality of cancer care system-wide. In her spare time, she enjoys spending time with her family, painting, traveling and playing tennis. Dr. Santiago is rated as an Advanced provider by MediFind in the treatment of Laryngeal Cancer. Her top areas of expertise are Laryngeal Cancer, Pleuropulmonary Blastoma, Lung Cancer, and Familial Prostate Cancer.

Mark Mcdonald is a Radiation Oncologist in Atlanta, Georgia. Dr. Mcdonald has been practicing medicine for over 22 years and is rated as a Distinguished provider by MediFind in the treatment of Laryngeal Cancer. His top areas of expertise are Adenoid Cystic Carcinoma, Laryngeal Cancer, Sinus Cancer, and Pancreatic Cancer.