Premise: Donald F. Gleason (November 20, 1920 – December 28, 2008) was an American physician and pathologist, best known for devising the "Gleason score" which predicts the aggressiveness of prostate cancer in patients. He was a former chief of pathology at the Minneapolis VA Medical Center, and received three degrees from and taught at the University of Minnesota.
Hypothesis: Donald F. Gleason died when he was 88.