His research focused on the role of the microcirculation in acute and chronic inflammation, and how risk factors for cardiovascular disease influence microvascular function. Granger has served on the editorial boards of the Heart & Circulation, GI & Liver, and Cell sections of the American Journal of Physiology, as well as Circulation Research, Microcirculation, Shock, Pathophysiology, Free Radical Biology & Medicine, Lymphatic Research and Biology, and Nitric Oxide Biology & Chemistry. He was Editor-in-Chief of Microcirculation and an Associate Editor of the American Journal of Physiology: GI & Liver Physiology.Dr. Granger was a member of the Clinical Sciences-2, Cardiovascular & Renal, and General Medicine-A2 Study Sections and the Gastrointestinal Mucosal Pathobiology Study Sections. He also served on several peer review panels and policy committees for the American Heart Association, the Research Committee of the American Gastroenterological Association, the Board of Directors of the Federation of American Societies for Experimental Biology, and the Physiology Test Committee of the National Board of Medical Examiners. Granger served as President of the American Physiological Society (APS) and the Microcirculatory Society (MCS).He has received several awards and honors for his research, including the APS Bowditch Award, the Distinguished Research Award from the GI Section of the APS, the Landis Award from the US Microcirculatory Society, the Laerdal Award from the Society for Critical Care Medicine, the McKenna Memorial Award from the Canadian Association of Gastroenterology, the Dolph Adams Award from the Society for Leukocyte Biology, the Career of Distinction Award from the Oxygen Society, the Nishimaru-Tsuchiya International Award from the Japanese Microcirculatory Society, the Robert M Berne Lectureship from the APS, and the Benjamin W. Zweifach Award from the US Microcirculatory Society. He was also designated a Highly Cited Investigator by the Institute for Scientific Information.