Sari van Poelje, TSTA-O, is an international team coach and expert on agile business innovation. Sari has 35 years' experience of coaching and consulting with managers and directors and is a licensed teaching and supervising transactional analyst in the organisational field, PCM trainer and coach, NOBCO-EMCC accredited master coach, systemic team coach. She is the owner of Intact Academy and has published numerous articles and books on leadership, coaching and organizational change.

Anne de Graaf, MA, is TSTA in the field of management and organizational development and CTA in the field of psychotherapy. He is currently the owner of RondHeel, consultancy and training. Anne was founder, trainer and supervisor at the Dutch TA academy and was a lecturer at the MSc Organizational TA program in the UK. Anne has published several articles and books, including the basic book on TA called Into TA, a comprehensive textbook on Transactional Analysis.