Clients enter therapy grappling with a range of difficulties. They don t speak in diagnostic terms, but instead focus on the everyday problems that confront them. Their struggles may include isolation, loneliness, anxiety, guilt and regret, and problems making decisions in a world that offers seemingly endless choice. In contrast, the cognitive-behavior therapist is trained in the language of conditioning and extinction, avoidance and safety behaviors, behavioral activation and attentional biases. This book explores the ideas of the existentialist philosophers as a bridge between the suffering client and technically trained clinician. The volume is not a rejection of cognitive behavior therapy (CBT), but seeks to place CBT in the broader context of the most popular philosophic tradition of the 19th and 20th centuries.