Carlo DiClemente is a prominent psychologist known for his work in the field of addiction and behavior change. He is best recognized for developing the Transtheoretical Model of Change, which outlines the stages individuals go through when modifying behavior. This model has been widely used in various settings, including substance abuse treatment and health promotion. DiClemente's research emphasizes the importance of understanding an individual's readiness to change, which can significantly impact the effectiveness of interventions. His contributions have influenced both clinical practices and public health strategies, making him a key figure in the study of behavioral psychology and addiction treatment.