Born May 28, 1807

Motier-en-Vuly, Switzerland

Died December 14, 1873

Cambridge, Massachusetts

Naturalist and teacher

Louis Agassiz. Library of Congress.

"The book of Nature is always open…. Strive to interpret what really exists."

Louis Agassiz (pronounced AG-uh-see) was the leading naturalist of the nineteenth century, advancing the study of nature through scientific observation. Born in Switzerland, he emigrated to the United States in middle age after his reputation was already well established. Agassiz was famed for his studies of glaciers, the moving rivers of ice that led Agassiz to formulate the notion of an "Ice Age" in the distant past. As a professor at Harvard University, Agassiz taught generations of students engaged in the scientific study of nature, which he regarded as evidence of God. On that basis, he led opposition to the new theory of evolution brought forth by English naturalist Charles Darwin (1809–1882).

Youth in Switzerland

Jean Louis...