I study how and why people revise self-views in response to social feedback. Stated otherwise, I study the social negotiation of self across the lifespan. As with any negotiation table, I view the table of identity negotiation as represented by two sides. My research represents both sides in two interrelated lines of inquiry. On the first side, I study the Psychology of the Changed. This line of inquiry explores how and why someone would revise a self-view in response to social feedback. Moreover, this line of inquiry examines the consequences of self-revision for ongoing mental health and well-being. On the flip side, I study the Psychology of the Changer. This line of inquiry explores how and why someone would try to change another person's self-views. Moreover, this line of inquiry examines the consequences of inducing self-revision in a social partner for ongoing relational satisfaction and well-being.