Continental philosopher and mathematician who pioneered the field of phenomenology. He saw experience as being equal to empiricism.
He studied mathematics, physics, and astronomy at the University of Leipzig from 1876 until 1878. He was taught by Wilhelm Wundt, a founder of modern psychology, at Leipzig.
His 1891 work Philosophie der Arithmetik. Psychologische und logische Untersuchungen was strongly criticized by Gottlob Frege.
He divorced Malvine Steinschneider in 1901.
He wrote a work that influenced the philosophy of Jean Paul Sartre.