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Michael Faraday
Born in 1791, Faraday was a self-taught English physicist. His famous experiments showed that electricity and magnetism were different expressions of the same phenomenon. He is the inventor of the dynamo which enabled the conversion of mechanical into electrical energy. He held that fields were physical realities and that the universe was a collection of fields. He also made major contributions to chemistry.

Michael Feigenbaum
American pioneer of chaos and complexity theory.

Paul Feyerabend
Austrian-American philosopher of science who held that all knowledge-claims are relative. Since science is not a privileged form of knowledge, he argued that the beliefs of science are no more rational than those of voodoo.

Ludwig Feuerbach
Feuerbach (1804-72) was a German philosopher who espoused thoroughgoing naturalism. According to him there was no God or personal immortality and nature encompassed all of reality.

Richard Feynman
Nobel Prize-winning quantum physicist who helped develop the mathematics underlying quantum electrodynamics, the interaction of electrons and photons. He said famously that no one understands quantum physics.

Sigmund Freud
Freud (1856-1939) is best known for his theory of the unconscious which attributed many every day impulses and actions to repressed feelings and desires usually sexual in nature. Freud's methods and motives in formulating his theories have been severely criticized in recent years.