Mary Leakey (6 February 1913 -- 9 December 1996) was a British archaeologist and anthropologist, who discovered the first fossilized Proconsul skull, an extinct ape now believed to be ancestral to humans, and also discovered the robust Zinjanthropus skull at Olduvai Gorge. For much of her career she worked together with her husband, Louis Leakey, in Olduvai Gorge, uncovering the tools and fossils of ancient hominines. She developed a system for classifying the stone tools found at Olduvai. She also discovered the Laetoli footprints. In 1960 she became director of excavation at Olduvai and subsequently took it over, building her own staff. After the death of her husband she became a leading palaeoanthropologist, helping to establish the Leakey tradition by training her son, Richard, in the field..