Robert H. Mach is the Britton Chance Professor of Radiology and director of the PET Radiochemistry Program at the University of Pennsylvania. Research in his lab is focused on development of radiotracers for studying the molecular basis of disease using the imaging technique, positron emission tomography or PET. He has more than 300 peer-reviewed publications and book chapters and holds 30 patents on the development of PET-based radiopharmaceuticals. Radiotracers developed in his lab have been or are being tested in 28 clinical trials.