Leslie Sokol, PhD, is director of education and one of the principal instructors with the internationally acclaimed Beck Institute for Cognitive Therapy and Research in Philadelphia.She has taught cognitive therapy to professional and paraprofessional groups, nationally and internationally, on such topics as- depression, anxiety, personality disorders, stress management, psychosis, substance abuse, and couples' problems. In addition to her roles at the Beck Institute, she maintains a private practice in a primary care setting in the Philadelphia area. In her role as chairman of behavioral science in the Family Practice Department at Mercy Suburban Hospital, she taught psychiatry to family medicine residents for 22 years. She continues to serve as the staff psychologist in the cardiac and physical rehabilitation departments.Dr. Sokol is a distinguished founding fellow of the Academy of Cognitive Therapy and a past president. Currently she serves as treasurer and chairman of its Credentials Committee. In these roles, she was intricately involved in the provision and development of training protocols to insure competency in cognitive therapy, and in the testing and utilization of tools to evaluate this competency. To further her mission of spreading accurate knowledge of cognitive therapy worldwide, she was representative at large for the IACP (International Association of Cognitive Psychotherapy). Marci Fox, PhD, a licensed psychologist, has been in private practice for almost 20 years and specializes in cognitive behavioral therapy with teens and adults. She has worked with the Beck Institute for Cognitive Behavior Therapy in Philadelphia for almost the same amount of time. As an Academy of Cognitive Therapy certified trainer/consultant and adjunct faculty member at the Beck Institute, she trains individuals in cognitive therapy both nationally and internationally. She is actively involved in training thousands of mental health professionals nationally to increase their competency in cognitive behavior therapy.Dr. Fox graduated with honors in psychology from Tulane University. Upon graduation, she received a master of science and doctorate in clinical psychology at the University of Miami. After a year as a medical psychology intern at Duke University Medical Center, she did a first-year postdoctoral fellowship at the Center for Cognitive Therapy at the University of Pennsylvania and a second-year postdoctoral fellowship at the Beck Institute for Cognitive Therapy and Research. She worked at the Beck Institute as a senior associate for five years before moving into private practice and continues to play an active role at the Beck Institute for Cognitive Behavior Therapy in their Extramural Training program, and now maintains a private practice in Boca Raton, Florida.