Given the immensity and philosophical importance of Heidegger's Gesamtausgabe, which now comprises more than 80 volumes, this long overdue and user-friendly Concordance will rapidly become an indispensable tool of Heidegger scholarship. -- Jean Grondin, Professor of Philosophy, Universite de Montreal, Canada The Heidegger Concordance fills a long-felt lacuna among Heidegger scholars of a comprehensive index that allows them to track the emergence, development, interrelationships, and at times decline of his many key concepts and so provides them with a holistic insight into the ways and changes of his thinking. -- Theodore Kisiel, Distinguished Research Professor Emeritus of Philosophy, Northern Illinois University, USA The Heidegger Concordance is a unique, essential, and extraordinary tool that gives scholars all they ever wanted: some form of index! It provides an extensive and precise navigation system that allows researchers to focus on about any specific topic. Above all, this concordance brings peace of mind to those researchers who tended to lose sleep, wondering what they might have forgotten in their reading of Heidegger or neglected to write down. -- Pol Vandevelde, Professor of Philosophy, Marquette University, USA