Carlo's career-long passion and dedication to create and research a functional, multidimensional and integrated care model for treating addiction has influenced the practice of providers from multiple disciplines. His thoughtful articles are highly cited in the field of addictive behaviors. His pioneering views on motivation, mechanisms of change and natural recovery have transformed clinical practice and influenced research in psychology,health and mental health. He has used stages and processes of change to understand how risk and protective factors influence initiation and recovery from addictions and created an innovative framework for linking prevention and treatment. Director of the Maryland Tobacco Resource Center, the Center for Community Collaboration and as University of Maryland, Baltimore County presidential research professor of psychology, he continues to make groundbreaking contributions by exploring how to help people change and training healthcare providers locally, nationally and internationally.