Sean Carroll is a physicist at the California Institute of Technology. He received his Ph.D. in 1993 from Harvard University. His research focuses on theoretical physics and cosmology, especially the origin and constituents of the universe. He has contributed to models of interactions between dark matter, dark energy, and ordinary matter; alternative theories of gravity; and violations of fundamental symmetries. Carroll is the author of From Eternity to Here: The Quest for the Ultimate Theory of Time, Spacetime and Geometry: An Introduction to General Relativity, and the forthcoming The Particle at the End of the Universe. He has appeared on TV shows such as The Colbert Report and Through the Wormhole with Morgan Freeman, and frequently serves as a science consultant for film and television. He lives in Los Angeles with his wife, writer Jennifer Ouellette.
William Lane Craig is a Research Professor of Philosophy at Talbot School of Theology in La Mirada, California. He earned a doctorate in philosophy at the University of Birmingham, England, before taking a doctorate in theology from the Ludwig-Maximilians-Universität München, Germany, where he was for two years a Fellow of the Alexander von Humboldt-Stiftung. Prior to his appointment at Talbot he spent seven years at the Higher Institute of Philosophy of the Katholike Universiteit Leuven, Belgium. Research interests include the interface of Philosophy of Religion and Philosophy of Space and Time. He has authored or edited over thirty books, including The Kalam Cosmological Argument; Theism, Atheism, and Big Bang Cosmology; Time and the Metaphysics of Relativity; and Einstein, Relativity, and Absolute Simultaneity. He has published over a hundred articles in professional journals such as The Journal of Philosophy, British Journal for the Philosophy of Science, International Studies in the Philosophy of Science, Philosophia Naturalis, andAstrophysics and Space Science.