Trained in radiation oncology at the University of Minnesota, Dr. Chen has spent the past four years as director of radiation oncology at Keesler Air Force Base in Biloxi, Miss. He led the rebuilding of the clinic after it was destroyed in Hurricane Katrina. His interests include lung cancer, prostate cancer, and breast cancer.  Dr. Chen is certified by the American Board of Radiology.  He is a Major in the United States Air Force.