In this introductory chapter, the editors of the present volume provide readers with the background necessary to understand the chapters that follow. They first acquaint readers with the concept of leadership and why leadership is necessary. Then, the editors briefly trace the history of leadership research and examine its major schools, most of which are reviewed in this book. Their historical overview is also necessary as an organizing framework because chapter authors frequently refer to elements of the history of leadership research. Next, the editors discuss emerging issues in leadership research and how findings are being consolidated. Finally, they provide an overview of the book and a summary of each chapter.