Emmert is a Senior Clinical Lecturer in Addiction Psychiatry at the National Addiction Centre, Institute of Psychiatry, Psychology & Neuroscience (IoPPN) and a Consultant Addiction Psychiatrist at the South London and the Maudsley (SLaM) NHS Foundation Trust.
He graduated with distinctions in Medicine (BMBCh) from the University of Oxford, and Epidemiology (MSc) from the London School of Hygiene and Tropical Medicine (LSHTM). He holds a PhD in Addiction Sciences from KCL, his thesis exploring how specialist drug and alcohol treatment provision in England impacts on hospitalisation and mortality.
He is currently an NIHR Advanced Fellow and a Commonwealth Fund Senior Harkness Fellow and holds membership at both the Royal College of Physicians and Psychiatrists.
During the COVID-19 outbreak he founded the Homeless Hotel Drug and Alcohol Service (HDAS) the first pan-London service to provide drug, alcohol and tobacco support to the population of people experiencing rough sleeping who were temporarily housed in emergency accommodation across the capital.