Dr. Robert Gillies holds the Martin Silbiger Endowed Chair and is Chair of the Department of Cancer Physiology and Vice-Chair (Research) of the Department of Radiology, H. Lee Moffitt Cancer Center and Research Institute; and Professor Emeritus, Departments of Radiology and Biomedical Engineering, College of Medicine University of Arizona. He is past president of the Society for Molecular Imaging and has served on numerous grant review panels for the NIH and the DoD, consulting on cancer physiology and imaging. Dr. Gillies is an expert in tumor acidity and has published extensively in this area of research.