RICHARD DAWKINS is an English ethologist, evolutionary biologist, and author.

Dawkins came to prominence with his 1976 book The Selfish Gene, which popularized the gene-centered view of evolution and introduced the term “meme”. In 1982, he introduced into evolutionary biology the influential concept that the phenotypic effects of a gene are not necessarily limited to an organism's body, but can stretch far into the environment, including the bodies of other organisms; this concept is presented in his book, The Extended Phenotype.

Dawkins has been called "the world's most famous Atheist". He is well known for his criticism of creationism and intelligent design. In his 2006 book The God Delusion, Dawkins contends that a supernatural creator almost certainly does not exist and that religious faith is a delusion. As of January 2010, the English-language version of his book had sold more than two million copies and had been translated into 31 languages. Today he is an emeritus fellow at the New College of the Humanities in London, England and founder of the Richard Dawkins Foundation For Reason and Science, which is a non-profit organization that promotes science and secular values around the world.

LAWRENCE KRAUSS is a theoretical physicist and cosmologist who is a professor of physics at Arizona State University, where he also serves as Foundation Professor of the School of Earth and Space Exploration and director of the Origins Project (a trans-disciplinary initiative that explores the most fundamental of questions who we are and where we came from).

He is most well known for his contributions to cosmology, as he was one of the first physicists to suggest that most of the mass and energy of the universe resides in empty space, an idea now widely known as dark energy.

Krauss is one of the few living physicists referred to by Scientific American as a "public intellectual", and he is the only physicist to have received awards from all three major U.S. physics societies: the American Physical Society, the American Association of Physics Teachers, and the American Institute of Physics. In 2012 he was awarded the National Science Board's Public Service Medal for his contributions to public education in science and engineering in the US.

He is the author of several bestselling books, including The Physics of Star Trek and A Universe from Nothing and he is an advocate of scientific skepticism, science education, and the science of morality.