born April 27, 1820, Derby, Derbyshire, Eng.
died Dec. 8, 1903, Brighton, Sussex
English sociologist and philosopher, advocate of the theory of social Darwinism .
His System of Synthetic Philosophy , 9 vol. (1855–96), held that the physical, organic, and social realms are interconnected and develop according to identical evolutionary principles, a scheme suggested by the evolution of biological species. This sociocultural evolution amounted to, in Spencer's phrase, "the survival of the fittest." The free market system, without interference by governments, would weed out the weak and unfit. His controversial laissez-faire philosophy was praised by social Darwinists such as William Graham Sumner and opposed by sociologists such as Lester Frank Ward. Liked or loathed, Spencer was one of the most discussed Victorian thinkers.