Kimberley Goldsmith is a reader in medical statistics in the Department of Biostatistics and Health Informatics. She has extensive experience in the design, conduct and analysis of clinical trials, particularly in complex interventions in mental health. She is interested in longitudinal modelling, mediation/mechanism of treatment analysis and the use of structural equation models to address questions in these areas. She has collaborated on important trials of complex interventions for chronic fatigue syndrome, depression and irritable bowel syndrome to name a few. Her work on these trials has led to key mediation/mechanism publications that are impacting on refinement of cognitive behavioural therapies, and on important papers on methods, such as this tutorial on longitudinal structural equation models for mediation.