Sheldon Lee Glashow is a Nobel Prize winning American theoretical physicist. He is the Metcalf Professor of Mathematics and Physics at Emeritus Boston University and Eugene Higgins Professor of Physics, Emeritus, at Harvard University. He won the Nobel Prize in 1979, along with Steven Weinberg and Abdus Salam, for their independent groundbreaking contributions to the theory of the unification of the weak and electromagnetic forces, a part of what is now known as the Standard Model of particle physics. He has made many seminal contributions to physics including predicting the existence of the charm quark and developing the first Grand Unified theory of fundamental interactions. In addition to his contributions to science, he has written three popular books on science.