Johann Friedrich Blumenbach (1752–1840), a German physician and naturalist, is regarded as a foundational figure in zoology and anthropology, pioneering comparative methods for examining human diversity. He categorized humans into five racial groups—Caucasian, Mongolian, Malayan, Ethiopian, and American—yet stressed their unity as a single species influenced by environmental and climatic conditions.
His work, such as De generis humani varietate nativa, highlighted gradual physical changes and rejected racial hierarchies, arguing that differences could be reversed through environmental adaptation. Although later misinterpreted, his theories provided essential foundations for modern anthropology, combining empirical observation with a sophisticated understanding of human variation.