James Marcia is a developmental psychologist best known for his work on identity formation during adolescence, particularly his theory that outlines four identity statuses: identity diffusion, identity foreclosure, identity moratorium, and identity achievement. His framework helps to understand how individuals explore and commit to various aspects of their identity, including values, beliefs, and career paths. Marciaโs theory is crucial for understanding the processes involved in personal identity development and the exploration of career options among adolescents.