This engaging, authoritative introductory text comprehensively describes the role of the school psychologist in promoting positive educational and mental health outcomes for all students in today's schools. The book emphasizes a data-driven, problem-solving based approach to prevention and intervention with diverse children, youth, and their families. The reader is equipped with vital tools for becoming a competent, ethical practitioner; effectively addressing students' emotional, behavioral, and academic needs; facilitating systems-level change; and using research as the basis for informed decision making. Special features include helpful vignettes, discussion questions, activities, and resources.