Tim Grennan, MD

Professor of Internal Medicine

(916) 686-7300

Tim Grennan, MD


  • B.S., Loyola University, Chicago, IL, 1972
  • M.D., University of Nebraska College of Medicine, Omaha, NE, 1976
  • Michigan State University, Kalamazoo, MI, campus, straight internal medicine internship, 1976-77
  • United States Air Force School of Aerospace Medicine, San Antonio, TX, Flight surgeon training, 1977
  • University of Michigan, Ann Arbor, MI, Internal Medicine Residency, 1979-81
  • University of Michigan, Ann Arbor, MI, Fellowship, medical oncology, 1981-83
  • United States Air Force Air War College, Maxwell AFB, AL, Graduate, 2000


As a College Master and Clinical Professor of Medicine at a new, innovative medical school, California Northstate College of Medicine, I am pleased to be a part of an excellent new program. Prior to my retirement from Kaiser Permanente in 2017, I was fortunate to serve as a Professor of Medicine at the University of California, Davis, (still involved in teaching at UCD) where I served as the medicine residency program site director and director of student clerkship programs for several decades at Kaiser Permanente, Sacramento. As the nations’ first fully integrated managed care program hospital with a university residency program (UC Davis), Kaiser Permanente provides a unique learning opportunity for medical education. I graduated from the University of Nebraska College of Medicine in 1976. After active duty as a flight surgeon in the Air Force, I completed my residency in medicine and fellowship in oncology at the University of Michigan. I returned to US Air Force as a reserve flight surgeon and held a number of leadership positions.

Research Interest

In the early 1990s, I was one of the three founding MDs for our Kaiser Permanente Oncology Clinical Trials Program which now has over 120 physicians, with over 60 active protocols and enrolling over 500 patients per year in one of the premier clinical trials programs on the west coast. In 2006, our clinical trials program won a national award from the American Society of Clinical Oncology and was also the 2007 recipient of the Morris F. Collen Award for Research.