Radiation Oncology Services
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In our hands, your cancer recovery start here . . . with our physicians

Our Physicians


john-warner-ray John Warner Ray, M.D., FACRO david-shaw David L. Shaw, M.D. john-giesler John H. Giesler, M.D.
diana-santiago Diana A. Santiago, M.D. peter-possert Peter W. Possert, M.D. robbie-medbery Robena “Robbie” Medbery, M.D.
nancy-wiggers Nancy H. Wiggers, M.D. kim-vu Kim Vu, M.D. geetha-rao Geetha S. Rao, M.D.
shelley-machuta Shelley R. Machuta, M.D. sasha-wahab Sasha H. Wahab, M.D. edmund-simon Edmund L. Simon, M.D.
heather-gatacombe Heather G. Gatcombe, M.D. sandra-gregory Sandra L. Gregory, M.D.

Our Physicians

  • John Warner Ray, M.D., FACRO
  • David L. Shaw, M.D.
  • John H. Giesler, M.D.
  • Diana A. Santiago, M.D.
  • Peter W. Possert, M.D.
  • Robena “Robbie” Medbery, M.D.
  • Nancy H. Wiggers, M.D.
  • Kim Vu, M.D.
  • Geetha S. Rao, M.D.
  • Shelley R. Machuta, M.D.
  • Sasha H. Wahab, M.D.
  • Edmund L. Simon, M.D.
  • Heather G. Gatcombe, M.D.
  • Sandra L. Gregory, M.D.

Did you know?

Since 1975, our Evidence Based Peer Review process continues to be an integral part of our practice.  Today, it is widely recognized for its effectiveness in providing the best in coordinated cancer care.

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