Louis G. Castonguay, PhD , is a professor of psychology at Penn State University. His work focuses on the process, outcome, and training of psychotherapy, as well as on the development of practice-research networks. He has coedited three books: on psychotherapy integration (with Conrad Lecomte), on principles of therapeutic change (with Larry Beutler), and on insight in psychotherapy (with Clara Hill).

J. Christopher Muran, PhD , is associate dean and professor, Derner Institute, Adelphi University, and director, Brief Psychotherapy Research Program, Beth Israel Medical Center. His research has concentrated on alliance ruptures and resolution processes and has resulted several book collaborations, including Negotiating the Therapeutic Alliance, Self-Relations in the Psychotherapy Process, Dialogues on Difference, and Therapeutic Alliance .

Lynne Angus, PhD , is a professor of psychology at York University in Toronto, Canada. She is the senior editor of the Handbook of Narrative and Psychotherapy (with John McLeod). Her research focuses on the investigation of narrative and emotion processes in psychotherapy, and she has developed the Narrative Processes Coding System (with Heidi Levitt and Karen Hardtke) for application in differing treatment approaches.

Jeffrey A. Hayes, PhD , is a professor of counseling psychology at Penn State University. His scholarship focuses on the psychotherapy relationship, with an emphasis on therapist factors and the integration of spirituality and psychology. He has coauthored two books with Charles Gelso, The Psychotherapy Relationship and Countertransference and the Therapists' Inner Experience: Perils and Possibilities .

Nicholas Ladany, PhD , is a professor of counseling psychology at Lehigh University in Bethlehem, Pennsylvania. He is the author of three books on supervision and training: Critical Events in Psychotherapy Supervision: An Interpersonal Approach; Counselor Supervision: Principles, Process, and Practice; and Practicing Counseling and Psychotherapy: Insights from Trainees, Clients, and Supervisors .

Timothy Anderson, PhD , is an associate professor of psychology at Ohio University in Athens. His current research is on the identification of common therapist factors that predict therapy processes and outcome. He is the recipient of the 2004 Distinguished Early Career Award from the International Society for Psychotherapy Research.