High Quality Content by WIKIPEDIA articles! Lisa Randall (born June 18, 1962) is an American theoretical physicist and a leading expert on particle physics and cosmology. She works on several of the competing models of string theory in the quest to explain the fabric of the universe. Her most well known contribution to the field is the Randall-Sundrum model, first published in 1999 with Raman Sundrum. She was the first tenured woman in the Princeton University physics department and the first tenured female theoretical physicist at both MIT and Harvard University. She has also written several popular science books and the libretto of an opera.