Synchronicity is the experience of two or more events that are apparently causally unrelated or unlikely to occur together by chance, yet are experienced as occurring together in a meaningful manner. This concept was first described in this terminology by Carl Gustav Jung, a Swiss psychologist, in the 1920s. Progoff, the author, who is both a Jung scholar, a teacher, and a practical and experiential proponent of Jung's work, discusses Jung and his relationship with this concept.