Some therapists are more effective than others, that much is clear why they are more effective is less clear. This book identifies which characteristics make therapists more or less effective in their work and proposes guidelines to improve their effectiveness.Editors Louis Castonguay and Clara Hill have gathered a panel of expert researchers and practitioners from diverse theoretical backgrounds to answer this complicated question. Synthesizing the rich literature on therapist effects in this comprehensive volume, they explore how various effects can help or hinder clients in therapy. They then propose practical strategies that mental health practitioners can use to improve their own effectiveness. Castonguay, Hill, and their contributors first lay the empirical foundations for understanding therapist effects and why they are important. They also acknowledge the massive variability that exists among therapists and the complexities of studying therapist effects. Drawing from this fundamental knowledge, they then carefully examine specific therapist characteristics, attitudes, and skills that are relevant in any therapeutic setting. Topics include therapists amp rsquo responsiveness, presence, attachment, and technical interventions cultural factors negative emotions humor and creativity. Exciting new studies about therapist effects in the treatment of specific disorders, including depression and generalized anxiety, are also presented. The closing chapters translate the book amp rsquo s general themes and takeaways into broader applications for research, intervention, training, and policy, including the role of routine outcome monitoring.