Walter Francis Willcox (1861–1964) was an American statistician and demographer. He was born in 1861 in New York City and graduated from Harvard University in 1883. He was a professor of economics and statistics at Cornell University from 1891 to 1925. Willcox was a pioneer in the field of demography, and his work was instrumental in the development of modern statistical methods. He was the first to use the term "demography" in a scientific context, and he was the first to use the term "population dynamics" to describe the study of population change. He was also the first to use the term "population pyramid" to describe the age-sex structure of a population. Willcox was a prolific writer, and his works include The Elements of Social Science (1902), The Principles of Population (1908), and The Population of the United States (1910). He was also a founding member of the American Statistical Association and served as its president from 1912 to 1913. Willcox died in 1964 at the age of 103. He is remembered as one of the most influential figures in the history of demography and population studies.
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