Bio sketch and research interests:  Mr. Bartee began his career in 1983 with the United States Air Force, where he received extensive training in radio-frequency production and radar. In 1990, Mr. Bartee joined Varian Oncology Systems as a senior field service engineer, where he was trained primarily on state-of-the-art medical linear accelerators. Since 1998, Mr. Bartee has been the senior clinical engineer for the Department of Radiation Oncology, and his activities include management of all the medical linear accelerators and simulators and research in intensity-modulated radiotherapy, electronic portal imaging and respiratory gating.