Jacob (Jake) Van Dyk is Professor Emeritus of Oncology and Medical Biophysics at Western University, London, Ontario, Canada, and former Manager of Physics and Engineering at the London Regional Cancer Program. He has >40 years of experience in the practical facets of radiation oncology physics with 24 years at the Princess Margaret Hospital (PMH) in Toronto and 15 years at the London Regional Cancer Program (LRCP). With a leave-of-absence in 1974-75, he worked as the acting head of physics at the Centre de Radiothérapy, Hôpital Cantonal de Génève, in Geneva, Switzerland. From 2009 to 2011, he was employed as a professional expert/consultant at the International Atomic Energy Agency (IAEA) in Vienna, Austria. He served as President of the Canadian College of Physicists in Medicine for four years. His research included practical aspects of clinical dosimetry, the assessment of radiobiological response especially related to lung injury, and multiple aspects of the implementation of modern technology into clinical practice. He was involved in over 200 publications along with four unique Volumes of "The Modern Technology of Radiation Oncology: A Compendium for Medical Physicists and Radiation Oncologists." He has lectured in >41 countries. He was the main founder of Medical Physics for World Benefit (www.MPWB.org), an organization devoted to supporting medical physics activities, largely by training and mentoring, especially for lower income settings. He has won various awards including the Gold Medal from the Canadian Organization of Medical Physicists and an honorary Doctor of Science (honoris causa) degree from Western University.