 He has contributed to the assimilation of cognitive science principles in the clinical field.A more specific contribution was focused on developing the theory and practice of rational-emotive and cognitive-behavioral therapies (CBT/REBT), which brought him both the Aaron T. Beck Award and the Albert Ellis Award of the International Institute for the Advanced Study of Psychotherapy and Applied Mental Health.In 2004 he was invited as "Guest Editor" by the "Journal of Clinical Psychology" to organize a special issue titled