You see, every creature alive on the earth today represents an unbroken line of life that stretches back to the first primitive organism to appear on this planet; and that is about three billion years.

He won a share of the 1967 Nobel Prize in Physiology or Medicine with Haldan Keffer Hartline and Ragnar Granit. In 1934 Wald went to Harvard University where he became an instructor then a professor. Wald then went on to work in Zurich Switzerland with the discoverer of vitamin A Paul Karrer.

George Wald (November 18 1906 – April 12 1997) was an American scientist who is best known for his work with pigments in the retina. He won a share of the 1967 Nobel Prize in Physiology or Medicine with Haldan Keffer Hartline and Ragnar Granit.