David_Sackett--John_James_Richard_Macleod

David Lawrence Sackett (November 17, 1934 – May 13, 2015) was an American-Canadian physician and a pioneer in evidence-based medicine. He is known as one of the fathers of Evidence-Based Medicine. He founded the first department of clinical epidemiology in Canada at McMaster University, and the Oxford Centre for Evidence-Based Medicine. He is well known for his textbooks Clinical Epidemiology and Evidence-Based Medicine.
One of his more famous quotes is: "Half of what you learn in medical school is dead wrong."