Elizabeth Plimpton

Dr. Elizabeth Plimpton is a cosmological physicist from Princeton University, who is under consideration for a position at the California Institute of Technology and comes to Pasadena as a personal guest of Sheldon Cooper. A leading expert on quantum cosmology, she authored a book entitled The Effervescent Universe. Leonardis a huge fan of her work and Sheldon thinks she is one of the great minds of the 21st century like himself.

She is very sexually active, successfully seducing Leonard within hours of meeting him and later attempting to seduce Raj, Howard, and Leonard for a four-way. (An upset Raj provides an escape route from his apartment for Leonard and Howard, once they realize they don't want to see each other naked, before Raj, presumably, sleeps with Dr. Plimpton.) It is unknown if Sheldon is still in touch with her after this visit. (The Plimpton Stimulation)