Donald Johanson is an American paleoanthropologist best known for his discovery of "Lucy," one of the most complete skeletons of Australopithecus afarensis. Lucy was found by Johanson and Tom Gray on November 24, 1974, at the site of Hadar in Ethiopia. The fossilized bones of Lucy constitute the oldest, most complete specimen of an extinct species which was not human, but from which the human race may be descended. Johanson is one of the most accomplished scholars in the field of human origins. He founded the Institute of Human Origins (IHO) in 1981 in Berkeley, California, where he served as the IHO’s director and as a research associate in the anthropology department at the University of California.