Sean Carroll is a theoretical physicist at the California Institute of Technology, specializing in cosmology, gravitation, field theory, and quantum mechanics. His research addresses the foundations of cosmology: What happened at the very beginning of the universe? Why was entropy low near the Big Bang? Is there an interpretation of quantum mechanics that applies to the universe as a whole? What are the dark matter and dark energy that dominate the universe today? How do complex structures evolve over time?
Carroll has been blogging regularly since 2004. His textbook "Spacetime and Geometry" has been adopted by a number of universities for their graduate courses in general relativity. He is a frequent public speaker, and has appeared on TV shows such as The Colbert Report and Through The Wormhole with Morgan Freeman. He has produced a set of lectures for The Teaching Company on dark matter and dark energy, and another on the nature of time. He has served as a science consultant for films such as Thor and TRON: Legacy, as well as for TV shows such as Fringe and Bones.
His 2010 popular book, "From Eternity to Here," explained the arrow of time and connected it with the origin of our universe. "The Particle at the End of the Universe," about the Large Hadron Collider and the quest to discover the Higgs boson, was released November 2012.
More information at http://preposterousuniverse.com/