This book presents the core principles of Viktor E. Frankl's Logotherapy, and outlines how Logotherapy can be used in conjunction with other forms of interventions. It illustrates that, beyond a philosophy, Logotherapy is also a theory of personality, and a form of therapy. The book aims to illustrate the inductive and deductive interplay between theory and practice. Volume I is devoted entirely to Logotheory. Volume II contains the chapters which portray the practical applications of Logotherapy. Each chapter ends with Points to Ponder, which aim to bridge the chapters, and to highlight connections between theory and practice. The Appendix is written in the form of a Study Guide, expanding on Logotherapy's applications in specific practice areas in line with current developments in mental health care. Corresponding to each chapter, the References section provides an extensive list of relevant sources, and related, up to date bibliography. The writing of this book follows the ground-structure of the Doctoral Dissertation entitled "The Applications of Viktor E. Frankl's Logotherapy in Counselling Psychology," (1999) by Maria (Ungar) Marshall, at the University of Alberta, Edmonton, Canada, which contains a comprehensive overview of the fundamental elements of the philosophy and practice of Logotherapy, based on an extensive review of international literature. Edward Marshall co-authored the present book, adding the chapters corresponding to the Appendix, reflecting developments in the practice, study and research in Logotherapy, since the submission of the original Dissertation, to the present. This up-to-date, and comprehensive review allows the reader to find situations in everyday life and in professional activities, where Logotherapy can be usefully applied.