This third edition offers 14 new chapters and a fully updated, comprehensive survey in the field of occupational psychology, including its history, theories, models, interventions, and empirical research. Focused on NIOSH Total Worker Health® model, this new edition in Occupational Health Psychology (OHP) reflects the expanding scope of the field, as well as recent changes in the nature and organization of work. It is an essential resource for practitioners and academics seeking to prioritize worker safety while simultaneously promoting their health and well-being. OHP is informed by research from subfields of psychology, including organizational/work psychology, human factors, cognitive, social, health, clinical, counseling and developmental psychology, as well as public health, preventive medicine, occupational medicine, ergonomics, and industrial hygiene. Historically, OHP focused on preventing worker illness, injury, or distress in their work environments. Today, the field has expanded to include more preventive, holistic approaches to worker well-being, which also encompass job and life satisfaction, positive emotional experiences, sense of meaning, and social support and relationships. OHP has also become more interdisciplinary and global.