Irving Fisher

Born in Saugerties, New York, in 1867, Irving Fisher studied at Yale, where he earned one of the earliest American Ph.D.s in economics and later taught for much of his career. Trained first in mathematics, he became known for bringing formal, analytical methods into economics at a time when the field was still taking shape in the United States.

Fisher is best remembered for major work on capital, interest, money, and price levels. He helped develop ideas that later became central to monetary theory, and his writings on debt and deflation gained renewed attention long after his death. He also invented and patented a successful card-index filing system, giving him an unusual career that mixed scholarship, public debate, and practical invention.

His public life was wide-ranging and controversial. He campaigned on issues including public health and monetary reform, but he is also associated with eugenics, a part of his record that cannot be overlooked. He died in New Haven, Connecticut, in 1947, leaving behind a body of work that is both highly influential and complicated.