 Theodosius Dobzhansky, writing in 1973, drew upon Teilhard's insistence that evolutionary theory provides the core of how man understands his relationship to nature, calling him "one of the great thinkers of our age".George Gaylord Simpson felt that if Teilhard were right, the lifework "of Huxley, Dobzhansky, and hundreds of others was not only wrong, but meaningless", and was mystified by their public support for him.He considered Teilhard a friend and his work in paleontology extensive and important, but expressed strongly adverse views of his contributions as scientific theorist and philosopher.