Jeans , Sir , James Hopwood , 1877-1946 , Knight , physicist and mathematician

Sir James Hopwood Jeans was born in Ormskirk, Lancashire, on 11 September 1877, and moved to London in 1880. A precocious child, he had a passion for clocks, writing a booklet about them at the age of nine. He attended Merchant Taylor's School from 1890-1896, then entered Trinity College where he was second wrangler on the mathematical tripos in 1898. While recovering from a tubercular infection of the joints, he took a first class on part two of the tripos in 1900 and was awarded a Smith's Prize. In 1901 he was elected a fellow of Trinity College, obtaining his MA in 1903. In 1904 he published his first treatise Dynamical Theory of Gases which became a standard textbook. Two further textbooks followed while he was professor of applied mathematics at Princeton University from 1906-1909. From 1910-1912 he was Stokes lecturer in applied mathematics at Cambridge. His Report on Radiation and the Quantum Theory in 1914 helped spread acceptance of quantum theory. Until this time he had been interested in molecular physics; then he turned his attention to astronomy, working on the equilibrium of rotating masses, culminating in his Adams Prize Essay Problems of Cosmogony and Stellar Dynamics. He continued to work on astrophysical problems, producing Astronomy and Cosmogony in 1928. From 1928, he occupied himself with the popularization of science, beginning with a series of lectures which served as a source for The Universe Around Us in 1929, followed by other publications in his fluent and stimulating style, though his final books Physics and Philosophy in 1943 and The Growth of Physical Science in 1947 were more historical and restrained. In 1907 he married Charlotte Tiffany Mitchell, an American from a wealthy family, by whom he had one daughter. Charlotte died in 1934, and he subsequently married Suzanne Hock, a concert organist. They had three children. Jeans died on 16 September 1946 of coronary thrombosis. He was awarded the Order of Merit, and was Secretary of the Royal Society, 1919-1929, and Vice President, 1938-1940.