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is a theoretical physicist and Professor Emeritus at the Institute for Advanced Study in Princeton. He has published many scientific papers and written many books, including Disturbing the Universe.

is a theoretical physicist and director of BEYOND: The Center for Fundamental Concepts in Science at Arizona State University. He has written widely about Einstein's understanding of time, including How to Build a Time Machine.

is a theoretical physicist and John S. Toll Professor of Physics at the University of Maryland. He's written widely on string theory, and has advanced unified field theories of the type first envisioned by Einstein.

is Associate Professor of Science Writing at MIT. He's produced "Einstein Revealed" for NOVA and has authored several books on science and technology, including Einstein in Berlin.