Physicians

Glenn Tonnesen, MD

Dr. Tonnesen came to Inova Fairfax Hospital in 1982, and from 1992 to 2005 served as the Chairman of the Department of Radiation Oncology. His special interest is in the advancing technology of Intensity Modulated Radiation Therapy (IMRT), particularly with TomoTherapy®. He sees patients with various malignancies, but especially head and neck, prostate, brain, thoracic and gastrointestinal tumors.

Dr. Tonnesen previously served as the Chief of Radiation Oncology at Bethesda Naval Hospital and Associate Director of Training in Radiation Oncology at the National Cancer Institute. His residency was at the Harvard Joint Center for Radiation Therapy, where was chief resident and later a member of the Harvard faculty. His medical training was at the University of Utah, where he graduated with honors and was elected to the Alpha Omega Alpha Medical Honor Society. He served a medical internship at Barnes Hospital in St. Louis, Missouri, followed by two years as a medical officer in the United States Navy. He earned a Bachelor of Science degree in Chemistry, with Honors, at Brown University.

Dr. Tonnesen is board certified in Radiation Oncology.


Susan Boylan, MD

Dr. Boylan joined Inova’s radiation oncology team in 1987. She is the Chairman of the Department of Radiation Oncology at Potomac Hospital, and Medical Director of the Potomac Radiation Oncology Center, a joint affiliation of Potomac Hospital and the Inova Health System. While Dr. Boylan sees a variety of patients, she has a particular interest in the treatment of breast cancer, and multimodality therapy for lung cancer.

Dr. Boylan graduated from Franklin and Marshall College with a degree in Biology, and completed her medical training at The Georgetown University School of Medicine. She completed her internship and residency in internal medicine at North Carolina Baptist Hospital, Wake Forest University. She then continued her training in radiation oncology, also at Wake Forest University.

Dr. Boylan is board certified in Internal Medicine and in Radiation Oncology.


Stella Hetelekidis, MD

Chair, Department of Radiation Oncology

Dr. Hetelekidis has been a member of the Inova Fairfax Hospital medical staff since 1999, and since 2005 she has served as the Chairman of the Department of Radiation Oncology. Her areas of interest are breast cancer, gynecologic and gastrointestinal malignancies.

Dr. Hetelekidis graduated from the Massachusetts Institute of Technology with Bachelor of Science degrees in both Biology and Literature. She received her MD degree from the University of Rochester where she was elected to the Alpha Omega Alpha Medical Honor Society. After a medical internship at Beth Israel Hospital in Boston, she completed a residency at the Joint Center for Radiation Therapy at Harvard Medical School. She served on the faculty of Duke University, and then returned to Harvard where she was appointed to the Harvard faculty and served as the Clinical Medical Director for the Department of Radiation Oncology at the Brigham and Women’s Hospital and the Dana-Farber Cancer Institute. She was a consultant at the Dana-Farber Breast Evaluation Clinic, and the Gynecologic Oncology Clinic. She has lectured and published research on the treatment of breast cancer.

Dr. Hetelekidis is board certified in Radiation Oncology.


Samir Kanani, MD

Dr. Kanani has been on the medical staff at Inova Fairfax Hospital since 2004, and is co-director of the Stereotactic Radiosurgery Program. His professional interests include treatment of cancers of the prostate, brain, lung, esophagus, head and neck and gastrointestinal tract.

Dr. Kanani attended the University of Texas at Austin and graduated summa cum laude with a degree in psychology and biology. He earned his MD degree at the University of Texas Medical School at Galveston, and served an internship at Pennsylvania State University. He completed his residency in radiation oncology at the University of Maryland, where he was Chief Resident. He dedicated his final year to research and training in brachytherapy (radiation implants) and radiosurgery.

Dr. Kanani is board certified in Radiation Oncology.


Gopal K. Bajaj, M.D.

Dr. Bajaj joined ROA in 2007. Prior to coming to Fairfax Hospital, he was on the faculty at Johns Hopkins Hospital Department of Radiation Oncology and Molecular Radiation Sciences where he served as chief of radiation oncology for the head and neck cancer service. He brings special expertise in the treatment of head and neck cancer and upper aerodigestive cancers, particularly through the use of TomoTherapy® and image guided radiation therapy (IGRT). His other areas of interest and include lung, esophageal, gastrointestinal, brain and prostate tumors.

Dr. Bajaj graduated with honors from the University of Kansas, receiving degrees in Biology and Genetics. He received his medical degree from the University of Kansas School of Medicine, where he was elected to the Alpha Omega Alpha Medical Honor Society. He has also performed cancer research at the Otto-von-Guericke Universität in Magdeburg, Germany and served a medical internship at Harvard Medical School’s Beth Israel Deaconess Medical Center, and completed a Radiation Oncology residency at The Johns Hopkins Hospital, where he was Chief Resident. He has lectured and published numerous textbook chapters, scientific articles and reviews on the treatment of head and neck cancers, prostate cancer, breast cancer and emerging technologies in radiation oncology, and remains active in teaching the current residents at the Johns Hopkins program.


Ashish Chawla, MD

Dr. Chawla joined ROA in 2011. Prior to this, he served as a Radiation Oncologist at Anne Arundel Medical Center in Annapolis, Maryland for the past seven years. There, he helped lead the cancer center's Stereotactic Radiosurgery Program with Brainlab technology, and served as Cancer Liaison for the American College of Surgeons' Commission on Cancer. He was Principal Investigator for numerous trials, including Partial Breast Irradiation (PBI) studies and Prostate, Central Nervous System and Head/Neck cancer investigations through the Radiation Therapy Oncology Group (RTOG). He was also involved in multidisciplinary cancer research collaborations with The Johns Hopkins Hospital.

Dr. Chawla received his undergraduate degree from Pennsylvania State University, graduating with honors in Biology. He received his M.D. from Thomas Jefferson University in Philadelphia in 1998, where he was elected to the Alpha Omega Alpha Medical Honor Society. He completed his Radiation Oncology training at Harvard's Massachusetts General Hospital in 2003, where he won awards for scholarly research as a Radiation Oncology resident. He has published several peer-reviewed articles related to prostate, breast and gastrointestinal cancer management, and has given national presentations regarding colorectal cancer, the use of PET/CT imaging in radiation therapy planning, and the use of Stereotactic Radiosurgery for facial pain disorders.

His clinical interests include the use of Stereotactic Radiosurgery (SRS) and Stereotactic Body Radiotherapy (SBRT) for tumors of the brain, spine, and lung. He has special expertise in SRS/SBRT for benign intracranial tumors and disorders, including acoustic neuromas, meningiomas, and Trigeminal Neuralgia (TN). His other areas of clinical interest and expertise include breast, lung, esophageal, prostate, and gastrointestinal tumors.

Dr. Chawla is board certified in Radiation Oncology.