Richard Dawkins is the retired Charles Simonyi, Professor of the Public Understanding of Science, a chair held at Oxford University. He is a biologist and zoologist by training and has been praised for his ability to elucidate biological functions.
His books include: The Selfish Gene (1976); The Blind Watchmaker (1986); Unweaving the Rainbow (1998); A Devil's Chaplain (2003); and The God Delusion (2006).
It is important to keep in mind that even whilst elucidating biology, Richard Dawkins is presenting observations of the natural world mixed with his particular atheistic worldview.
Richard Dawkins claims it is almost certain (99% to be exact) that there is no God. Although, when Ben Stein asked him, "How do you know?" he admitted he had no reason for the quantification and he was since then stated, "God is not dead. He was never alive in the first place."
Having been raised an Anglican, he experienced doubts upon learning of the various religions at the age of nine. At 16, he was taught the Darwinian theory of evolution and believed it could do the job of explaining life, and thus, warding off God into the realm of delusion.