John Quincy Stewart
Encyclopedia
John Quincy Stewart was an American
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 astrophysicist.

He obtained his Ph.D. in physics
Physics
Physics is a natural science that involves the study of matter and its motion through spacetime, along with related concepts such as energy and force. More broadly, it is the general analysis of nature, conducted in order to understand how the universe behaves.Physics is one of the oldest academic...

 from Princeton University
Princeton University
Princeton University is a private research university located in Princeton, New Jersey, United States. The school is one of the eight universities of the Ivy League, and is one of the nine Colonial Colleges founded before the American Revolution....

 in 1919. He taught astrophysics
Astrophysics
Astrophysics is the branch of astronomy that deals with the physics of the universe, including the physical properties of celestial objects, as well as their interactions and behavior...

 at Princeton from 1921 until he retired in 1963.

Stewart was a civilian aeronautical engineer, an Army 1st Lieutenant, and later served as a chief instructor in the Army Engineering School, during World War I
World War I
World War I , which was predominantly called the World War or the Great War from its occurrence until 1939, and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918...

. He was later a research engineer in the American Telephone and Telegraph Company. He became interested in social physics in 1946, (first investigated in 1693 by astronomer
Astronomer
An astronomer is a scientist who studies celestial bodies such as planets, stars and galaxies.Historically, astronomy was more concerned with the classification and description of phenomena in the sky, while astrophysics attempted to explain these phenomena and the differences between them using...

 Edmund Halley), demonstrating the use of physical laws in the area of social sciences, for example, demographic gravitation
Demographic Gravitation
Demographic gravitation is a concept of "social physics", introduced by Princeton University astrophysicist John Quincy Stewart in 1947. It is an attempt to use equations and notions of classical physics - such as gravity - to seek simplified insights and even laws of demographic behaviour for...

.

He co-wrote an influential two-volume textbook in 1927 with Raymond Smith Dugan
Raymond Smith Dugan
Raymond Smith Dugan was an American astronomer and a graduate of Amherst College in Massachusetts .Dugan obtained his Masters Degree from Amherst College in 1902, and then received his Ph.D...

 and Henry Norris Russell
Henry Norris Russell
Henry Norris Russell was an American astronomer who, along with Ejnar Hertzsprung, developed the Hertzsprung–Russell diagram . In 1923, working with Frederick Saunders, he developed Russell–Saunders coupling which is also known as LS coupling.-Biography:Russell was born in 1877 in Oyster Bay, New...

: Astronomy: A Revision of Young’s Manual of Astronomy (Ginn & Co., Boston, 1926–27, 1938, 1945). This became the standard astronomy textbook for about two decades. There were two volumes: the first was The Solar System and the second was Astrophysics and Stellar Astronomy.

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