Lisa Randall 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. Her best known contribution to the field is the Randall–Sundrum model, first published in 1999 with Raman Sundrum. Randall-Sundrum theory predictions are subject to ongoing tests at the LHC. However, the experimental signature that would be required to validate the Randall-Sundrum model would be the discovery of a class of particles called Kaluza-Klein particles. This would constitute a monumental discovery in physics. It would be the first physical evidence that superstring theory is on the right track. Given the magnitude of such a discovery, administration at the Large Hadron Collider would undoubtedly hold a press conference to announce such a discovery. Furthermore, the physics literature would thoroughly address this discovery. Since neither of these events has transpired, the following can be safely concluded. To date, the L.H.C has yet to produce any evidence to validate the Randall-Sundrum model at slightly over half of its energy capability. 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 two popular science books and the libretto of an opera.