Dr. Gregory S. Sibley joined Virginia Cancer Specialists after 14 years in Radiation Oncology at Sibley Memorial Hospital in Washington, D.C. Throughout his career, Dr. Sibley has focused on providing the highest quality care in the field of radiation oncology. He has positioned himself as an expert in the multi-disciplinary treatment of cancer and in state-of-the-art radiation treatment planning techniques. Within the US Oncology Network, Dr. Sibley is a member of the Executive Committee for Radiation Oncology and Vice-Chair for the Technology Committee. Dr. Sibley has authored over 20 peer-reviewed publications, many while on faculty at Duke University Medical Center. Although well-versed in the treatment of multiple cancers, Dr. Sibley has special interest in breast cancer, brachytherapy for prostate cancer, and intensity-modulated radiotherapy for head and neck, and lung cancers.
In his spare time, Dr. Sibley is an avid hockey player and triathlete.


















