One of the most important scientists of the entire 21st century.
His first book "The Selfish Gene" revolutionized molecular biology, and created about 10% of the terms that science uses today within the subject.
And you cant really find a more fluent and precise speaker than Dawkins. Ive never, ever heard him stutter or slip up in what he is saying. Even if you dont agree with him, anyone can still realize that he makes everything sound so clear and reasonable.