Hans Reichenbach (/ˈraɪxənbɑːx/; German: [ˈʁaɪçənbax]; September 26, 1891 – April 9, 1953) was a leading philosopher of science, educator, and proponent of logical empiricism.

Carl Gustav Hempel, Richard von Mises, David Hilbert and Kurt Grelling all became members of the Berlin Circle.

He married Selma Menzel, a school mistress, who came from a long line of Protestant professionals which went back to the Reformation.

After completing secondary school in Hamburg, Hans Reichenbach studied civil engineering at the Hochschule für Technik Stuttgart, and physics, mathematics and philosophy at various universities, including Berlin, Erlangen, Göttingen and Munich.

[10] In 1919 his text Student und Sozialismus: mit einem Anhang: Programm der Sozialistischen Studentenpartei was published by Hermann Schüller, an activist with the League for Proletarian Culture.

While working as a physicist and engineer, Reichenbach attended Albert Einstein's lectures on the theory of relativity in Berlin from 1917 to 1920.

Axioms of coordination are those laws which describe all things and are a priori, like Euclidean geometry and are “general rules according to which the connections take place”.

When Adolf Hitler became Chancellor of Germany in 1933, Reichenbach was immediately dismissed from his appointment at the University of Berlin under the government's so called "Race Laws" due to his Jewish ancestry.

In 1938, with the help of Charles W. Morris, Reichenbach moved to the United States to take up a professorship at the University of California, Los Angeles in its Philosophy Department.

Reichenbach helped establish UCLA as a leading philosophy department in the United States in the post-war period.

[14] This work resulted in two books published posthumously: The Direction of Time and Nomological Statements and Admissible Operations.