Final answer:
Carl Rogers is the psychologist associated with congruence, a concept in humanistic psychology that describes harmony between an individual's actual self and ideal self, leading to well-being.
Step-by-step explanation:
The psychologist associated with the concept of congruence or harmony with self is Carl Rogers. Rogers introduced the notion of self-concept, which consists of our thoughts and feelings about ourselves. Congruence occurs when there is a match between our actual selves (who we are) and our ideal selves (who we wish to be), leading to a state of inner harmony and well-being. Incongruence, on the other hand, arises when there is a significant discrepancy between the two, which can lead to maladjustment and distress. Rogers's humanistic psychology emphasizes the potential for good within all people and suggests that achieving congruence is an essential part of a healthy, productive life.