Jim Lyng, Ph.D. is a counselling psychologist with twenty-five years clinical experience in mental health services for adults and adolescents and a senior DBT trainer. For many years he led a community-based DBT team as well as serving as an adjunct assistant professor at the School of Psychology at Trinity College Dublin where he taught and supervised on cognitive-behavioural therapies. He is an active, grant-supported researcher and has recently co-led an award winning programme of service transformation to reduce waiting times at Jigsaw, the centre for youth mental health in Ireland, where he is currently the national clinical practice lead. Christine Dunkley DClinP, FSfDBT is a consultant DBT trainer with thirty years' NHS experience. She has authored numerous papers and books, including Regulating Emotion the DBT Way. Founding Chair of the Society for DBT and member of the UCL Expert Reference Group for Personality Disorders, she received a Learning Contributor award from NICE. Her 'top tips' have gained a lively LinkedIn following. Christine is an Executive Director at British Isles DBT Training and is internationally recognised as a trainer, mentor, and keynote speaker. Janet Feigenbaum, Ph.D. is an associate professor in clinical psychology and an international consultant DBT trainer. Following her original training with treatment developer Marsha Linehan, Janet was research lead for a randomized controlled trial of DBT in a naturalistic NHS setting in London. Janet then established the DBT programme in North East London, which was selected as one of three personality disorder demonstration sites by the UK Department of Health. Janet has been awarded an NIHR programme grant to develop and evaluate DBT for unemployment. She was a founding member of the Society for DBT. Amy Gaglia Essletzbichler, Ph.D. is a consultant trainer with the British Isles DBT training team and an accredited DBT supervisor. She has trained hundreds therapists throughout the UK and Europe and supervises therapists across Europe. She is the Director of Applied Research and Training in DBT for Intercontinental Business Support, GmbH. She has researched and written about consultation team and supervision in DBT and is highly involved in DBT adherence and fidelity work. She is the current chair and a member of the board of the European DBT Association. Michaela Swales, Ph.D. is professor in clinical psychology and director of the North Wales Clinical Psychology Programme at Bangor University. She is the director of the British Isles DBT Training Team, recognised internationally for its quality. She has trained more than a thousand professionals in DBT, seeding over 400 programmes, in both the UK and further afield. Michaela co-authored, Dialectical Behaviour Therapy: Distinctive Features (2009; 2017) and Changing Behavior in DBT: Problem-Solving in Action (2015). She is the Editor of the Oxford Handbook of DBT (2019) and president of the World DBT Association.