As the founder of one of the most influential schools of psychological thought — analytical psychology — Carl Jung (also known as CG Jung) experienced what today we might call a form of psychosis. It probably wasn’t a complete psychotic break, because Jung still functioned in his daily life.
His psychosis began when he was 38 years old, when he started finding himself haunted by visions in his head and started hearing voices. Jung himself worried about this “psychosis” — things that today we’d might say were consistent with symptoms of schizophrenia (a term he also used to describe himself during this period).
Jung didn’t let these visions and hallucinations slow him down, and continued seeing patients and actively engaging in his professional life. In fact, he so enjoyed the unconscious mind he had unleashed, he found a way to summon it whenever he wanted.