Chester Middlebrook Pierce and the birth of microaggression

This article explores the historical context in which the concept of microaggression was produced and the psychological model that supported it. Microaggression has become a popular term used to describe the stress of minoritized groups beyond the experience of racism. This article presents a genealogical perspective informing the contemporary uses of the term. The concept of "microaggression" was developed by Black psychiatrist Chester Middlebrook Pierce (1927-2016), professor of psychiatry and education at Harvard University. Pierce played an important role in conceptualizing the relationships between the mental health of individuals and groups, and their environment. The career and story of Chester M. Pierce bear witness to the construction of the relation between racism and mental health in a therapeutic culture "in the making." Through a selective biographical account of the career and research of Pierce, this article examines what brought him to coin the term microaggression. It also considers the wider context of the political mobilization of behavioral sciences to understand and address social inequalities in the United States. The notion of microaggression was a conceptual tool used by Pierce to describe how racism is perpetuated as a psychological phenomenon and to help develop awareness of the need to propose defensive strategies. The contextualization of Pierce's research and achievements aims therefore to contribute to the history of American "therapeutic culture" and the discussion of the role that psychological concepts such as microaggression are assumed to play in the psychologization of power relations and everyday life. (PsycInfo Database Record (c) 2026 APA, all rights reserved).