Existential Therapy is set out as a perspective that belongs to a certain style of professional practice in therapy, a relational paradigm, and a fundamentally philosophical frame of reference. The idea is not imposing it as THE model to follow, but as a valid option for those who wish to train as therapists, or those who already have but wish to enrich their professional practice with new perspectives.Even though the existential developments in psychology and therapy are not new, it s interesting to point out that maybe the 21st Century -an era of multiple tensions that range from war to economics, from medicine to ecology-, is when we most need its presence and also when it can be better understood, since the existential approach respond to time of crisis.This book has emerge from the need to introduce the existential therapeutic model in a clear an synthetic manner, and aspires to make known the Mexican School of Existential Therapy.The promotion of a new and different way of addressing this approach is consistent with the phenomenological- existential views, wich encourage the possibility of accessing our knowledge of human experience by means of the validation of different perspectives.It is divided in two volumes: Volume 1 deals with the philosophical and epistemological basis of Existential Therapy, that is, its theoretical ground. Volume II introduces the maps or the specific ways in which this type of therapy can be performed. In other words, it s about the practice."Reader, be prepared to be challenged and surprised and... Entranced. Although, as you would expect, Existential Therapy: Relational theory and practice for a post-Cartesian world addresses and explores those themes and topics that would be expected of any serious existential text - and, by the by, does so brilliantly - it is through its mestizo way of presenting them that the novelty and richness of its voice, and what that voice communicates to us, shines forth."- From the foreword by Ernesto Spinelli.I hope this book will be an invitation to dialogue and conversation