Eric K. Hansen, MDThe Oregon ClinicRadiation OncologyProvidence St. Vincent Medical CenterPortland, OR, USA Mack Roach III MD, FACR, FASTROProfessorRadiation Oncology and UrologyDirectorParticle Therapy Research Program & OutreachDepartment of Radiation OncologyUCSF Helen Diller Family Comprehensive Cancer CenterSan Francisco, CA, USA Eric Hansen is a Board Certified Radiation Oncologist. He graduated with honors from Yale University (BA) and Oregon Health & Science University (MD). He completed his radiation oncology residency at University of California San Francisco. Dr. Hansen served as President of the Oregon Radiation Oncology Society and is a member of the American Society of Radiation Oncology. Mack Roach III, MD, is a Professor of Radiation Oncology, Medical Oncology and Urology, at the University of California, San Francisco. Roach earned his MD from Stanford University School of Medicine. His major research interest involves the application of 3-D conformal and intensity modulated radiotherapy (IMRT) treatment planning technology as a major component of combined modality management of prostate cancer and other solid tumors.