Emily A. Holmes, DClinPsy, PhD, is Professor of Psychology in the Department of Psychology at Uppsala University in Uppsala, Sweden, and in the Department of Clinical Neuroscience at the Karolinska Institutet, Stockholm, Sweden. She is Visiting Professor of Clinical Psychology at the University of Oxford, United Kingdom. Her research and publications focus on mental imagery and emotion across psychological disorders. She is a clinical psychologist with a PhD in cognitive neuroscience. Dr. Holmes is an associate editor of Behaviour Research and Therapy and serves on the Board of Trustees of the international mental health research charity MQ: Transforming Mental Health. She is a recipient of the May Davidson Award from the British Psychological Society, the Comenius Early Career Award from the European Federation of Psychologists' Associations, and the Award for Distinguished Early Career Scientific Contribution to Psychology from the American Psychological Association, among other honors. She is a member of the Royal Swedish Academy of Sciences. Susie A. Hales, DClinPsy, is Research Tutor and Clinical Psychologist at the Oxford Institute of Clinical Psychology Training, University of Oxford, and Oxford Health NHS Foundation Trust, United Kingdom. Her research focuses on mental imagery processes and treatment innovation for mood disorders. Dr. Hales has published papers on psychological aspects of bipolar disorder and suicidality, and on novel ways of delivering cognitive therapy. She is active in the supervision and training of mental health professionals in a range of research and clinical competencies, with a particular emphasis on the provision of imagery-focused cognitive therapy training workshops. Kerry Young, DipClinPsy, is Consultant Clinical Psychologist and Clinical Lead of the Woodfield Trauma Service in London, United Kingdom. She is also Honorary Lecturer in Clinical Psychology at University College London and a clinician at the Oxford Rose Clinic. Dr. Young is an expert in mental imagery techniques, particularly imagery rescripting and its use with clients who have experienced complex trauma. She has published in the area of trauma and mental imagery. Martina Di Simplicio, MD, PhD, is Clinical Senior Lecturer in Psychiatry at the Centre for Psychiatry, Imperial College London, United Kingdom, and Honorary Consultant Psychiatrist in the West London NHS Trust. Her research focuses on understanding the cognitive mechanisms that underlie psychopathology and that drive successful treatment of mental disorders. Dr. Di Simplicio investigates the role of mental imagery in regulating emotions, with the aim of developing innovative digital interventions for young people who experience mood instability and self-harm. She has published on emotion processing, neuroimaging, psychopharmacology, and mental imagery.