Erik Sahai is the head of the Tumour Cell Biology laboratory at the Francis Crick Institute in London. Erik obtained his PhD with Richard Treisman in London studying RhoGTPases and their effectors. He then carried out post-doctoral work in both London (Chris Marshall) and New York (John Condeelis). Following this training, Erik set up his own group at the Cancer Research UK London Research Institute in 2004 and then transferred to the Francis Crick Institute in 2015. His research is focused on the spread of cancer through the body and responses to cancer therapy. In particular, his group is interested in stromal fibroblasts and their interplay with both tumour and immune cells. To study these problems his group uses a wide range of techniques from computational modelling of cell migration, through conventional cell and molecular biology, to intravital imaging of mouse tumours and live analysis of patient derived material.