Radiation Oncology

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The Medical Physics Section of the Department of Radiation Oncology at the Medical College of Wisconsin consists of 13 physicists, 10 dosimetrists, 6 postdoctoral research fellows, and 4 physics residents.  The goals of the Medical Physics Section are:

  • To provide the best possible radiation therapy technical support for the patients treated at all sites serviced by the Department of Radiation Oncology
  • Through clinical research, develop the accuracy and efficiency of cancer treatment, integrating new technical innovations in radiation therapy
  • To educate future generations of physicians and physicists in the art and science of radiation oncology physics

Chief of Medical Physics

X. Allen Li, PhD

Clinical Director of Medical Physics

Guang-Pei Chen, PhD


Physicist Assistants

Postdoctoral Fellows 

Physics Residents 


  • Nicole Beth, RTT, CMD
  • Joanne Breen, RT(R)(T), CMD
  • Joann Herman, RTT(R)(T), CMD
  • Jarred Hieneman, RTT, CMD
  • Dana Koller, RTT, CMD
  • Kirk Morris, RT(R)(T), CMD
  • Karen Niemczyk, RTT, CMD
  • Daniel Olson, RT(R), CMD
  • Krystal Spahos, RTT, CMD
  • Kevin Sonnemann, RTT, CMD



© 2014 Medical College of Wisconsin
Page Updated 09/10/2014