Donald Johanson
Donald Johanson is an American paleoanthropologist best known for discovering the fossilized remains of the early hominid Australopithecus afarensis, famously known as 'Lucy'.
"What's changed is we now have good anatomical, geological, archaeological evidence that Neanderthals are not our ancestors. When I wrote 'Lucy,' I considered Neanderthals ancestors of modern humans. We have gone back twice the age of Lucy, six million years. And we see that upright bipedal walking goes back that far in time."