Surveys). He chaired the workgroups of both the 5th edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5) and the 11th edition of the International Classification of Disorders (ICD-11) on obsessive-compulsive and related disorders. Stein has been ranked as one of the most cited anxiety disorder researchers globally, and his Google h-index is more than 150, one of the highest of any African scholar. Publications Stein has authored or edited over 40 volumes. These include volumes on clinical neuroscience: Cognitive-Affective Neuroscience of Mood and Anxiety Disorders; on clinical disorders: Handbook of Obsessive-Compulsive and Related Disorders; and on global mental health: Global Mental Health and Psychotherapy. He authored the Textbook of Anxiety Disorders, and the Textbook of Mood Disorders. Stein's papers have been published in Science, Lancet, and World Psychiatry. or ORCID. Psychiatry writings Stein was Eric Hollander’s first post-doctoral fellow, and subsequently led work in the area of obsessive-compulsive spectrum of disorders, including work on trichotillomania, and contributed to a number of publications for the DSM-5 and ICD-11 Workgroups on OC spectrum disorders, supporting the inclusion of these conditions in both nosologies. In collaboration with Brian Harvey, Stein has contributed to work on animal models relevant to understanding the neurobiology of obsessive-compulsive disorder and posttraumatic stress disorder. In particular, they helped to establish the deermouse model of stereotypy. Stein has co-led ENIGMA-OCD with Odile van den Heuvel, ENIGMA-Anxiety with Nic van der Wee, Janna-Marie Bas-Hoogendam, and Nynke Groenewold; and ENIGMA-HIV with Neda Jehanshad. This work has led to a number of key findings, including publications emphasizing the role of the thalamus in OCD. Together with his doctoral student, Helena Thornton, Stein initiated work on the neuropsychology of Urbach-Wiethe disease (UWD). Jack van Honk subsequently led a range of work on this condition. His investigations have shed important light on the specific contribution of the basolateral amygdala (BLA) to a range of cognitive-affective processes. For example, the BLA adaptively regulates escape behavior from imminent threat, a mechanism that is evolutionary conserved across rodents and humans. Furthermore, the human BLA is essential for instrumental behaviors in social-economic interactions. Stein has led or contributed to trials on anxiety and related disorders, including generalized anxiety disorder, obsessive-compulsive disorder, panic disorder, posttraumatic stress disorder, social anxiety disorder, and trichotillomania. He has also led or contributed to systematic reviews of such work, including a number of reviews for the Cochrane Collaboration. In the context