John Bayouth, PhD, is a Professor of Radiation Medicine, Vice Chair and Director of Physics at Oregon Health & Science University. Dr. Bayouth has many years of experience in intensity modulation radiation therapy treatment planning (IMRT), image guided radiation therapy (IGRT), respiratory gated imaging and radiation therapy, and functional imaging for treatment planning and response to therapy. He led the development of respiratory motion management in Radiation Therapy at the University of Iowa, University of Wisconsin-Madison, and now at OHSU; this has included the respiratory training strategy, imaging acquisition approach, treatment planning, and gated delivery. I continue to acquire and analyze 4DCT images to quantify longitudinal ventilation changes following radiation therapy. At the University of Wisconsin-Madison he was responsible for the clinical implementation of the MRI-guided radiation therapy device, where patients were imaged daily providing a wealth of tumor and normal tissue response information.