I cannot give any scientist of any age better advice than this: the intensity of a conviction that a hypothesis is true has no bearing over whether it is true or not.

He was awarded the 1960 Nobel Prize in Physiology or Medicine with Sir Frank Macfarlane Burnet.

Until he was partially disabled by a cerebral infarction Medawar was Director of the National Institute for Medical Research at Mill Hill. Sir Peter Brian Medawar OM CBE FRS (28 February 1915 – 2 October 1987) was a British biologist born in Brazil whose work on graft rejection and the discovery of acquired immune tolerance was fundamental to the practice of tissue and organ transplants. He was awarded the 1960 Nobel Prize in Physiology or Medicine with Sir Frank Macfarlane Burnet.