While Einstein engaged in the pursuit of what he called as "Unity" in the complex phenomena of the Universe, Oppenheimer engaged in the establishment of an "Unified" framework at the Institute for Advanced Study, which would comprise all the academic disciplines of knowledge that can be pursued. Einstein was markedly individualistic in his approach to physics. He had only few students, and was disinterested if not adversarial in his relation with formal institutions and politics. Oppenheimer was more collaborative and embraced collective scientific work. He had been a better successful teacher and more immersed in political and institutional realms. Oppenheimer emerged as a powerful political 'insider', a role that Einstein never embraced but instead wondered why Oppenheimer desired such power. Despite their differences in stances, both Oppenheimer and Einstein were regarded as "deeply suspicious" figures by the authorities, specifically by J. Edgar Hoover.