Mark Horowitz is a training psychiatrist, now working as a Clinical Research Fellow at UCL and North East London NHS Foundation Trust. He is an Associate Editor of the journal Therapeutic Advances in Psychopharmacology and has edited a collection of papers in the journal on Discontinuing Psychotropic Medication. He has a PhD in psychopharmacology and the neurobiology of depression from the Institute of Psychiatry, Psychology and Neuroscience at King’s College London. He has an interest in rational psychopharmacology and safe deprescribing of psychiatric medications, which has been the focus of his recent work published in The Lancet Psychiatry, JAMA Psychiatry, the British Journal of Psychiatry and Schizophrenia Bulletin, as well as a forthcoming textbook on the subject.