The book offers a practice-oriented and scientific introduction to the application areas of psychology in personnel management. The range covers essential components of the classic personnel cycle. It includes recruitment, selection, and onboarding of new employees, as well as leadership, motivation, and personnel development, extending to application areas in coaching and health management. Current topics such as compliance management and digitalization - the world of work 4.0 - are particularly addressed. The authors, established in both research and practice, translate scientific findings into professional practice. Thus, the book is aimed not only at students and educators of psychology or business psychology but also at HR practitioners who wish to enhance the quality of their work through theoretically grounded and evidence-based concepts and methods.