This book provides an assessment of the legacy, challenges and future directions of Critical Theory in the fields of International Relations and Security Studies. This book provides 'first-hand' interviews with some of the pioneers of Critical Theory in the fields of International Relations Theory and Security Studies. The interviews are combined innovatively with reflective essays to create an engaging and accessible discussion of the legacy and challenges of critical thinking. A unique forum that combines first-person discussion and secondary commentary on a variety of theoretical positions, the book explores in detail the interaction between different theories and approaches, including postcolonialism, feminism, and poststructuralism. Scholars from a variety of theoretical backgrounds reflect on the strengths and problems of critical theory, recasting the theoretical discussion about critical theory in the study of world politics and examining the future of the discipline. Both an introduction and an advanced engagement with theoretical developments over the past three decades, Critical Theory in International Relations and Security Studies will be of interest to students and scholars of International Politics, Security Studies and Philosophy.