Gemma completed her PhD, 'Family and genetic influences on child and adolescent depression', at the Department of Psychological Medicine and Clinical Neurosciences, Cardiff University (2012). She used several large, longitudinal, genetically sensitive datasets (e.g. twins and children conceived via IVF) to test environmental influences on depression that are independent of genetics. After her PhD she conducted an evaluation of the Family Drug and Alcohol Court (FDAC), a specialised intervention for parents with substance abuse and psychiatric problems. She also worked for the National Centre for Social Research (NatCen) as a quantitative researcher in the Children and Young People team. From October 2014 she worked as a Research Associate in the Department of Psychiatry, University of Cambridge, investigating adolescent depression using a longitudinal population-based sample, the ROOTS study. She also assisted in the development of the Neurosciences in Psychiatry Network (NSPN), a large study of the development of the adolescent brain. She has been based at the Division of Psychiatry at University College London since November 2015. She is investigating the development and treatment of adolescent and adult depression using research methods from epidemiology and psychology.