Mary Main is a prominent psychologist known for her work in the field of attachment theory. She collaborated with John Bowlby and contributed significantly to understanding how early relationships with caregivers influence emotional and social development. Main developed the Adult Attachment Interview, a tool used to assess adult attachment styles based on their childhood experiences. Her research led to the identification of the disorganized attachment style, which describes children who display a lack of clear attachment behavior. This concept has been influential in both clinical and developmental psychology, helping professionals understand the complexities of attachment in various contexts.