William Zebina Ripley (October 13, 1867 – August 16, 1941) was an American economist, lecturer at Columbia University, professor of economics at MIT, professor of political economy at Harvard University, and racial anthropologist. Ripley was famous for his criticisms of American railroad economics and American business practices in the 1920s and 1930s, and later for his tripartite racial theory of Europe. His work of racial anthropology was later taken up by racial physical anthropologists, eugenicists, and white supremacists, and was considered a valid academic work at the time, although today it is considered to be a prime example of scientific racism. Early life and education He was born in Medford, Massachusetts, in 1867 to Nathaniel L. Ripley and Estimate R. E. Ripley (née Baldwin). He attended the Massachusetts Institute of Technology for his undergraduate education in engineering, graduating in 1890, and he received a master's and doctorate degree from Columbia University in 1892 and 1893 respectively. In 1893, he was married to Ida S. Davis. From 1893 to 1901, Ripley lectured on sociology at Columbia University and from 1895 to 1901, he was a professor of economics at MIT. From 1901 onwards, he was a professor of political economics at Harvard University. He was a corresponding member of the Anthropological Society of Paris, the Roman Anthropological Society, the Cherbourg Society of Natural Sciences, and in 1898 and 1900 to 1901, he was the vice president of the American Economic Association. Career The Races of Europe In 1899, he authored a book entitled The Races of Europe: A Sociological Study, which had grown out of a series of lectures he had given at the Lowell Institute at Columbia in 1896. Like many Americans of his time, at every level of education, Ripley believed that the concept of race was explanatory of human difference. Even further, he believed it to be the central engine to understanding human history, although his work also afforded strong weight to environmental and non-biological factors, such as traditions. He believed, as he wrote in the introduction to Races of Europe, that: "Race, properly speaking, is responsible only for those peculiarities, mental or bodily, which are transmitted with constancy along the lines of direct physical descent from father to son. Many mental traits, aptitudes, or proclivities, on the other hand, which reappear persistently in successive populations may be derived from an entirely different source. They may have descended