Hans Reichenbach was a German philosopher and logician, born on September 26, 1891, in Berlin. He is best known for his work in the philosophy of science and his contributions to the development of logical positivism. Reichenbach emphasized the importance of empirical evidence and scientific methods in understanding the world. In 1938, Reichenbach emigrated to the United States due to the rise of the Nazi regime. He became a prominent figure at the University of California, Los Angeles (UCLA), where he continued to influence the fields of philosophy and science until his death on April 9, 1953. His ideas remain significant in discussions about the nature of scientific theories and knowledge.