Francisco Javier Peñas Esteban, one of the founding members of this journal, and one of the oldest and most active participants, passed away suddenly on the 19th February, 2018.
University teacher Peñas was the one who introduced many of us to the theory of international relations, the one who made us read the classics (realism, liberalism and marxism) but, above all, the one who encouraged us to “explore new avenues” which were opening up back in the middle of the 1990s, thanks to a reflectivist and sociological shift. Because of his suggestions, typical of a tireless and avid reader, and someone passionate about the Socratic method, we delved into these new openings and discovered intriguing contributions that schools like social constructivism, postcolonialism, feminism, poststructuralism, critical security studies etc. have brought to the discipline. Professor Peñas had, similarly, another exceptional quality: that of being a true “teacher,” someone who taught us to think, and to question our own beliefs, assumptions, and prior knowledge. It is for these reasons that we would like to dedicate edition 40 of the journal to pay a deserved homage through an engagement with his work, his publications and his teachings. An engagement that, as he would have wanted, is critical and inspired, with the aim of continuing to drive through this journal a critical approach to the discipline of international relations and an understanding of the complex international world that we live in.