Dr. Ruddy is a clinician-scientist and an international leader in cardiovascular nuclear medicine. His research focuses on the development and validation of imaging techniques using SPECT and PET radiotracers for the diagnosis and evaluation of cardiovascular disease. He has published over 250 peer-reviewed manuscripts and book chapters in highly ranked cardiovascular journals and has an H-index of 51. Dr. Ruddy has had continuous peer-reviewed and industry funding from major agencies including the Heart and Stroke Foundation of Ontario, Canadian Institutes of Health Research, National Cancer Institute of Canada, and the Ontario Research Fund. He is on the editorial board of the Journal of Nuclear Cardiology. He has given over 400 presentations at national and international scientific meetings. He has trained over 100 residents and fellows in cardiac imaging and cardiology.