[1][2] He was admitted to École normale supérieure in Paris in 1931, where he studied mathematics and was a classmate of Georges Pompidou, former President of France.

In the meantime, with the advent of World War II, he was enlisted to French Army and worked as an engineer for Maginot Line.

Following the Battle of France in 1940, he escaped through North Africa and returned to the United States in 1941 to resume his teaching duties.

[1] In 1947, Deschamps joined Federal Telecommunications Laboratories of ITT Inc. as a project engineer, where he worked on radio navigation and antenna design.

[6] His main research work at his tenure at University of Illinois at Urbana-Champaign included ray theory of electromagnetics, high-frequency asymptotics and complex point source representations of Gaussian beams, last of which he introduced.