Carl Gustav Jung was a Swiss psychiatrist and psychoanalyst who founded analytical psychology. Jung's work has been influential in the fields of psychiatry, anthropology, archaeology, literature, philosophy, psychology, and religious studies. He worked as a research scientist at the Burghölzli psychiatric hospital, in Zurich, under Eugen Bleuler. Jung established himself as an influential mind of his time, developing a friendship with Sigmund Freud, founder of psychoanalysis, conducting a lengthy correspondence, paramount to their joint vision of human psychology. He is regarded as one of the most influential psychologists in history.