Francis Crick (1916-2004), British microbiologist best known as a co-discoverer of the structure of DNA (deoxyribonucleic acid). Crick worked with James Watson at the Cavendish Laboratory, Cambridge, in 1951. Their work on DNA was performed with a knowledge of Chargaff's ratios of the bases in DNA and access to the X-ray crystallography of Maurice Wilkins and Rosalind Franklin at King's College London. Combining this knowledge led to the deduction that DNA exists as a double helix. Crick, Watson and Wilkins shared the 1962 Nobel Prize for Physiology or Medicine, Franklin having died in 1958. Photograph distributed in 1960 for the Albert Lasker Basic Medical Research Award.