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