Mihaly Robert Csikszentmihalyi was a Hungarian-American psychologist. He recognized and named the psychological concept of "flow", a highly focused mental state conducive to productivity. He was the Distinguished Professor of Psychology and Management at Claremont Graduate University. Earlier, he served as the head of the department of psychology at the University of Chicago and of the department of sociology and anthropology at Lake Forest College.

Flow in positive psychology, also known colloquially as being in the zone, is the mental state in which a person performing some activity is fully immersed in a feeling of energized focus, full involvement, and enjoyment in the process of the activity. In essence, flow is characterized by the complete absorption in what one does, and a resulting transformation in one's sense of time. Flow is the melting together of action and consciousness; the state of finding a balance between a skill and how challenging that task is. It requires a high level of concentration. Flow is used as a coping skill for stress and anxiety when productively pursuing a form of leisure that matches one's skill set.