( Stanley Smith Stevens)
Stanley Smith Stevens (1906-1973) was an Americanpsychologist best known as the founder of Harvard's Psycho-Acoustic Laboratory and credited with the introduction of Stevens' power law. Stevens authored a milestone textbook, the 1400+ page "Handbook of Experimental Psychology" (1951). He was also one of the founding organizers of the Psychonomic Society. In 1946 he introduced a theory of levels of measurement often used by statisticians.