Question: What is the name of the economist that worked alongside physicists Eugene Wigner and John Archibald Wheeler as part of the Princeton Three?

<P0-S0> The Wigner–Eckart theorem is a theorem of representation theory and quantum mechanics. <P0-S1>  It states that matrix elements of spherical tensor operators on the basis of angular momentum eigenstates can be expressed as the product of two factors, one of which is independent of angular momentum orientation, and the other a Clebsch–Gordan coefficient. <P0-S2>  The name derives from physicists Eugene Wigner and Carl Eckart, who developed the formalism as a link between the symmetry transformation groups of space (applied to the Schrödinger equations) and the laws of conservation of energy, momentum, and angular momentum. <SEP> <P1-S0> The Princeton Three was a group of two physicists and a political economist working at the Princeton University during the Cold War Era. <P1-S1>  Of the three men Eugene Wigner and John Archibald Wheeler studied physics and Oskar Morgenstern studied political economy. <P1-S2>  Their main goal was to establish a national science laboratory in the United States of America that would help America catch the Soviet Union in the Intermediate range ballistic missile (IRBM) race, as well as push the United States ahead in the space race. <P1-S3>  The basic outline of this laboratory called for university scientists to have complete and open insight to the militaristic needs if the country in order to spend some two or three years working full-time, without the shackles of administrative bodies or security restrictions. <P1-S4>  They would use their specific field of study to improve the defense systems of the military and other important project deemed necessary. <SEP> <P2-S0> The no-hair theorem postulates that all black hole solutions of the Einstein-Maxwell equations of gravitation and electromagnetism in general relativity can be completely characterized by only three "externally" observable classical parameters: mass, electric charge, and angular momentum. <P2-S1>  All other information (for which "hair" is a metaphor) about the matter which formed a black hole or is falling into it, "disappears" behind the black-hole event horizon and is therefore permanently inaccessible to external observers. <P2-S2>  Physicist John Archibald Wheeler expressed this idea with the phrase "black holes have no hair" which was the origin of the name. <P2-S3>  In a later interview, John Wheeler says that Jacob Bekenstein coined this phrase. <SEP> <P3-S0> John Archibald Wheeler (July 9, 1911 – April 13, 2008) was an American theoretical physicist. <P3-S1>  He was largely responsible for reviving interest in general relativity in the United States after World War II. <P3-S2>  Wheeler also worked with Niels Bohr in explaining the basic principles behind nuclear fission. <P3-S3>  Together with Gregory Breit, Wheeler developed the concept of Breit–Wheeler process. <P3-S4>  He is best known for linking the term "black hole" to objects with gravitational collapse already predicted early in the 20th century, for coining the terms "quantum foam", "neutron moderator", "wormhole" and "it from bit", and for hypothesizing the "one-electron universe".