# Robert Yerkes **Robert Mearns Yerkes** (1876–1956) was an American psychologist, ethologist, and primatologist whose career braided together the three strands of early twentieth-century [[Scientific Racism]]: intelligence testing, [[Eugenics]], and immigration restriction. He is the single most important institutional link between the psychometric movement and the legislative machinery that produced the [[Immigration Act of 1924]]. ## Early Career Yerkes earned his doctorate at Harvard in 1902 and spent two decades on its faculty before moving to Yale in 1924, where he chaired the psychology department and founded its Laboratories of Primate Biology. His early research spanned comparative psychology and animal behavior, but his ambitions were institutional: he wanted to make psychology a hard science with policy relevance, and [[World War I]] gave him the opening. ## Army Intelligence Testing As president of the American Psychological Association in 1917, Yerkes chaired the Committee on the Psychological Examination of Recruits and directed the development of the Army Alpha and Army Beta tests. Army Alpha was a written examination for literate English-speaking recruits; Army Beta was a nonverbal, picture-completion instrument designed for the roughly thirty percent who could not read English well enough to sit Alpha. By the November 1918 armistice, the program had tested approximately 1.75 million men — the largest psychometric exercise attempted to that date. The results, published in 1921 as *Psychological Examining in the United States Army*, became enormously influential — and enormously misused. Yerkes and his collaborators, including [[Lewis Terman]] and [[Carl Brigham]], read the data as demonstrating hereditary rank ordering among immigrant national groups: Northern Europeans scored highest, Southern and Eastern Europeans lowest. The finding was the empirical centerpiece of the restrictionist argument. ## The Data Did Not Hold Up The rank ordering tracked years of residence in the United States almost exactly — which is what an acculturation and language-familiarity measure looks like, not a heredity measure. [[Walter Lippmann]] demolished the hereditarian interpretation in a famous series of essays in *The New Republic* in 1922–1923, the [[Lippmann Intelligence Testing Series]], arguing that the tests measured education and cultural exposure, not innate capacity. Brigham himself recanted in 1930, acknowledging that his earlier analysis in *A Study of American Intelligence* (1923) had been methodologically indefensible. Yerkes never recanted. ## Eugenics Advocacy Yerkes's eugenics involvement was direct rather than incidental. He chaired the Committee on Inheritance of Mental Traits at the Eugenics Record Office and served as an expert eugenics agent to the House Committee on Immigration and Naturalization — the committee whose hearings, shaped by testimony from Yerkes, [[Henry Goddard]], and [[Madison Grant]], produced the [[Immigration Act of 1924]] and its national-origins quota system. That act essentially closed the door to Southern and Eastern European immigration for four decades. He was also a member of the American Eugenics Society and contributed to the broader institutional network documented in the [[Eugenics Timeline]]. His career illustrates how [[Social Darwinism]] moved from salon ideology to federal policy through the credentialing authority of elite universities and professional associations. ## Institutional Network Yerkes did not operate in isolation. His collaborators and protégés formed a network that institutionalized [[Scientific Racism]] across American psychology and policy. [[Lewis Terman]] at Stanford developed the Stanford-Binet IQ test and shared Yerkes's hereditarian convictions. [[Carl Brigham]], who served under Yerkes in the Army testing program, published *A Study of American Intelligence* in 1923 — the book that translated Army test data into a racial hierarchy and became the intellectual ammunition for the restrictionist movement. [[Henry Goddard]], who had introduced the Binet tests to America, supplied the "feeblemindedness" framework that justified both immigration restriction and compulsory sterilization. Together, these figures constituted the core of a scientific establishment that gave academic credibility to [[White Supremacy]]. Their work was cited in congressional hearings, reprinted in popular eugenics literature, and used to justify policies from the national-origins quota system to state sterilization laws. ## Primate Research and Later Career Yerkes founded the primate laboratories at Yale that eventually became the Yerkes National Primate Research Center at Emory University. His primate work was groundbreaking in its own right — pioneering long-term behavioral studies of chimpanzees and great apes. Emory removed his name from the facility in 2022, citing his eugenics advocacy. ## KB Significance Yerkes is a through-line figure: he connects the [[Scientific Racism]] of the early twentieth century to the [[Immigration]] restriction regime, the [[Nativism]] of the 1920s, and the institutional architecture of American psychology. The Army testing program's legacy extends to standardized testing generally — Brigham's later work led directly to the SAT. The pattern Yerkes exemplifies — prestigious institutional affiliation laundering ideologically motivated pseudoscience into policy — recurs throughout the KB. ## See Also - [[Eugenics]] - [[Scientific Racism]] - [[Eugenics Timeline]] - [[Immigration Act of 1924]] - [[Lewis Terman]] - [[Carl Brigham]] - [[Henry Goddard]] - [[Walter Lippmann]] - [[Lippmann Intelligence Testing Series]] - [[Nativism]] - [[White Supremacy]] - [[Social Darwinism]]