In memory of Mark Widdowson

This section of the journal is dedicated to the memory of Mark Widdowson, a Teaching and Supervising Transactional Analyst in the field of Psychotherapy (TSTA-P), senior lecturer in counseling and psychotherapy at the University of Salford, Associate Director of The Berne Institute and Director of Manchester Psychotherapy Foundation. Mark Widdowson has made a great contribution to the development of transactional analysis, in particular to the development of research in the field of TA. He was an ambassador for scientific research, primarily on the effectiveness of using transactional analysis to treat depression. He encouraged and motivated many to invest their energy in popularizing scientific research on psychotherapeutic methods. In this section, we have collected the memories of Russian colleagues about Mark, as well as some of his works and recommendations.