Dewey B. Larson (Nov 1, 1898 - May 25, 1990) was an American engineer and theoretician born in McCanna, North Dakota. The author of several works on the fundamental nature of the universe and the originator of the Reciprocal System of physical theory, Larson developed a consistent and comprehensive theoretical framework to explain natural phenomena from sub-atomic particles to super-galaxies. By answering questions such as, “Why does light sometimes behave as a particle and sometimes as a wave?”, “What is the origin of gravity?”, and "How are galaxies and quasars related?” the breadth of Larson's work is unmatched by any other scientific investigator, past or present.