Professor Goldfarb

Professor Goldfarb is a Jewish physicist at Caltech, who objects to Sheldon's plans to solve the Middle-East Crisis by building an exact replica of Jerusalem in the middle of the Mexican Sonoran Desert in order to make a new promised land. He is seen discussing the matter with him at Dennis Kim's welcoming party, wearing a yarmulke. (The Jerusalem Duality)

In The Hamburger Postulate, Sheldon mentions to Leonard that he and Leslie could manufacture a Mr. & Mrs. Golfarb, perhaps in reference to Professor Goldfarb.