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was a philosopher and psychologist but was most well known in the field of Psychology for developing the philosophy of pragmatism, or the Functionalist theory: "Theory of mental life and behavior that is concerned with how an organism uses its perceptual abiliti ....

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.... on an exploring expedition in Brazil with the Swiss-American naturalist Louis Agassiz and also studied psychology in Germany. During this time, William retired due to illness but that didn’t stop his from excelling in the field. Three years later, in 1872, at the age of thirty, William become an instructor in physiology at Harvard University. In 1875, William started teaching Psychology at Harvard and after 1880 he was teaching both classes. He taught at Harvard for thirty-five years, during which time; he wrote his first (and only) book; had his essays and lectures published in three different books: The Will to Believe and Other Essays i ....