Which person who introduced the method of random phase approximation was born December 20, 1917?
Random phase approximation:  It was first introduced by David Bohm and David Pines as an important result in a series of seminal papers of 1952 and 1953. David Bohm: David Joseph Bohm FRS (December 20, 1917 – October 27, 1992) was an American scientist who has been described as one of the most significant theoretical physicists of the 20th century and who contributed unorthodox ideas to quantum theory, neuropsychology and the philosophy of mind.
David Bohm