The Simons Foundation recently featured Princeton University Professor Paul Steinhardt in its web video series, "Four Minutes With."

Steinhardt, a 2018 Simons Fellow in theoretical physics, explains how he has changed his thinking on cosmic inflation and the Big Bang theory and is now reconsidering a "Big Bounce" cyclical theory of the universe. Steinhardt was a key developer of the inflation theory. 

Professor Steinhardt is co-director of the Princeton Center for Theoretical Science and is a professor in the departments of both physics and astrophysical sciences.

Watch Professor Steinhardt's interview.