Mona Sue Weissmark is an American clinical and social psychologist, whose work on the inter-generational impact of injustice has received international recognition. She is best known for her groundbreaking social experiment of bringing children of Holocaust survivors face-to-face with children of Nazis, and later, grandchildren and great-grandchildren of African American slaves with slave owners. She is also a professor of Psychology at Northwestern University and author of numerous journal articles and two books: Doing Psychotherapy Effectively (1998) and Justice Matters (2004).