Guillem Feixas graduated from the Universitat de Barcelona (UB), Barcelona, Spain in 1984 and obtained a scholarship from the Ministry of Education and Science to complete his doctorate. During this period, he completed his clinical training in existential psychotherapy and systemic family therapy (Hospital de la Santa Creu i Sant Pau). In 1987, he was awarded the Young Investigator Award by the Institute for Personal Construct Psychology. In the 1988–1989 academic year, he held a postdoctoral position at Memphis State University (now the University of Memphis). With another ministerial scholarship, he returned to UB to work in the Department of Personality, Assessment, and Psychological Treatments (currently merged into the Clinical Psychology and Psychobiology Department) where he obtained the position of associate professor (tenure) in 1992 and became a full professor in 2011. Since then, he has taught undergraduate courses on psychotherapy, clinical psychology, and systemic family intervention and has taught in a variety of master’s programs in the Faculty of Psychology at UB. The primary focus of his research has been to advance the understanding of interpersonal construing and to further the knowledge of its role in health (both mental and physical) and in the process of psychotherapy. To this aim, personal construct and self-regulation theories have been important sources of inspiration for implementation, both in research and clinical practice.