photo of John T. Barrett, MD, PhD

John T. Barrett, MD, PhD

  • Interim Chair of Radiation Oncology


Dr. John Barrett is currently the interim chair for the Medical College of Georgia's Department of Radiation Oncology. Known as a strong advocate for his patients and concerned with not only providing the best of care, but communicating effectively with patients and their families.  Dr. Barrett is an enthusiastic proponent of an interdisciplinary approach to cancer care.  He makes it a point to communicate effectively with the Georgia Cancer Center treatment team.  He received his medical degree and PhD from University of South Carolina, Columbia, SC in 1985.  He then completed his PhD and completed his residency at the National Cancer Institute, Bethesda, MD. Prior to that, he completed internal medicine residency at McGraw Medical Center of Northwestern University, Chicago, IL and started as a hematology/oncology fellow for a year and then shifted to radiation oncology.  Dr. Barrett has participated in translational and cooperative group trials.


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photo of Ahmad Al-Basheer, MPH, PhD

Ahmad Al-Basheer, MPH, PhD

  • Professor of Radiation Oncology
  • Clinical Director of Medical Physics


Dr. Al-Basheer acquired his Masters of Science in Nuclear Engineering from the University of Florida in 2004, where he also obtained his PhD in Nuclear Engineering in 2008.  He completed his certification in the Therapeutic Radiological Physics program of the American Board of Radiology (2011) and as an Authorized Medical Physicist from the State of Georgia, Georgia Department of Natural Resources (2016).  Currently, he is an Associate Professor in the Medical College of Georgia, as well as in the College of Allied Health Sciences.  His most recent publication is Radio-Immunotherapy Using the Ido-Inhibitor Indoximod in Combination with Re-Irradiation for Children with Progressive Brain Tumors in the Phase 1 Setting: An Updated Report of Safety and Tolerability.


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photo of Catherine Ferguson, MD

Catherine Ferguson, MD

  • Associate Professor of Radiation Oncology


Dr. Ferguson received her medical degree from the Medical College of Virginia, where she also completed her residency and a fellowship in radiation therapy.  She participates in many group clinical trials and her clinical interests encompass gynecological, breast and gastrointestinal cancers.



photo of William R. Grubb, MD

William R. Grubb, MD

  • Assistant Professor, Radiation Oncology


photo of Chulhaeng Huh, PhD

Chulhaeng Huh, PhD

  • Assistant Professor of Radiation Oncology
  • Medical Physicist


Dr. Huh received his PhD in Nuclear Engineering from the University of Florida.  He obtained a certificate in the Therapeutic Radiological Physics program from the American Board of Radiology in 2010.  He is currently an Assistant Professor in the Medical College of Georgia and works within the Georgia Cancer Center Radiation Therapy facility.




photo of Nahid Mivechi, PhD

Nahid Mivechi, PhD

  • Director, Center for Molecular Caperone/Radiobiology & Cancer Virology
  • Professor, Radiation Oncology


Dr. Mivechi's primary focus of research in her laboratory, over the past two decades, has been to investigate the regulation and function of mammalian heat shock transcription factors (HSFs) (HSF1, HSF2, HSF4) in the cellular stress response. A second, more recent focus has been to study the cellular processes via which organelle-specific molecular chaperones (cytosolic, mitochondrial and endoplasmic reticulum-resident heat shock proteins) mediate the host response to environmental stressors and the role of these processes in human diseases including cancer.



photo of Farshad Mostafaei, PhD

Farshad Mostafaei, PhD

  • Assistant Professor, Radiation Oncology
  • Medical Physicist