David Bohm
David Joseph Bohm FRS (December 20, 1917 – October 27, 1992) was an American theoretical physicist who contributed innovative and unorthodox ideas to quantum theory, philosophy of mind, and neuropsychology. He is considered to be one of the most significant theoretical physicists of the 20th century. Bohm advanced the view that the old Cartesian model of reality (that there were two interacting kinds of substance - mental and physical) was limited, in the light of developments in quantum physics. He developed in detail a mathematical and physical theory of implicate and explicate order to complement it. He also believed that the working of the brain, at the cellular level, obeyed the mathematics of some quantum effects, and postulated that thought was distributed and non-localised in the way that quantum entities do not readily fit into our conventional model of space and time. [not in citation given] Bohm warned of the dangers of rampant reason and technology, advocating instead the need for genuine supportive dialogue which he claimed could broaden and unify conflicting and troublesome divisions in the social world. In this his epistemology mirrored his ontological viewpoint. Due to his youthful Communist affiliations, Bohm was targeted during the McCarthy era, leading him to leave the United States. He pursued his scientific career in several countries, becoming first a Brazilian, then a British, citizen. His main concern has been with understanding the nature of reality in general and of consciousness in particular as a coherent whole, which according to Bohm is never static or complete but which is an unending process of movement and unfoldment.