Curtis Paul Clausen (March 28, 1893 – February 28, 1976) was an American entomologist and professor at the University of California, Riverside, who specialized in biological control.
He served in the US Army Coast Artillery for fourteen months and joined the US Department of Agriculture at the Bureau of Entomology in 1920.
He then traveled around the world searching and studying the biology of potential insect control agents.
By 1931 he built a catalog of 6000 references on life history studies of insect parasites and predators.
[3] Clausen retired in 1951 from the US department of agriculture and then worked as a professor of biological control at the University of California.