Anthony W. Bateman is Consultant Psychiatrist and Psychotherapist, Halliwick Unit, Barnet, Enfield, and Haringey Mental Health Trust, Visiting Professor University College, London and Consultant to the Anna Freud Centre, London. He developed mentalization based treatment with Peter Fonagy for borderline personality disorder and studied its effectiveness in research trials. An adapted version is now being used in other psychiatric disorders and in the treatment of families and adolescents. He was an expert member of National Institute for Clinical Excellence (NICE) development group for treatment guidelines for Borderline Personality Disorder in UK. He is President of the European Society for the Study of Personality Disorders (ESSPD). He has authored several books including 'Psychotherapy for Borderline Personality Disorder: Mentalization based treatment' and 'Mentalization Based Treatment for Borderline Personality Disorder: A practical guide' (with Peter Fonagy). Roy Krawitz is a psychiatrist and Honorary Clinical Senior Lecturer (Auckland University) specializing for the last 20 years in working with people with borderline personality disorder (BPD), and is a director and trainer of a company providing DBT training. Roy has published research demonstrating the effectiveness of his generalist borderline personality disorder trainings (125 two-day trainings), the clinical effectiveness of his past therapy, and the clinical effectiveness of the DBT service in which he works. Roy is the author of 14 scientific articles and 5 other books on BPD (including client and clinician guides published by Oxford University Press in four languages in total).