Dr Tracy Glass is a statistician with 20 years of experience working in the fields of cancer and infectious diseases research. She is Head of the Clinical Statistics and Data Management group in the Department of Medicine at the Swiss Tropical and Public Health Institute (Swiss TPH). Her interest lies in designing and conducting clinical trials at all phases of development and she has extensive experience of complex cluster trials in low-resource settings. Her research focuses on the causal modelling of observational data. Dr Glass is an associate professor at the University of Basel and teaches several statistics courses at the post-graduate level. She has an MSc in statistics from the University of Washington, USA, and a PhD in epidemiology from the University of Basel.