Mike McGrew is Group Leader, Developmental Biology, at The Roslin Institute, University of Edinburgh. He obtained his PhD from Boston University in 1998 and pursued a research program in embryology at the IBDM, France. There, he was part of a research group that discovered a basic mechanism controlling the timing of the formation of body segments in vertebrates, now known as the ‘segmentation clock’. Afterwards, he joined The Roslin Institute in 2001 to help develop transgenesis in chickens for use in developmental biology and bio-pharming. His research interests are now focused on a specialised type of stem cell; the primordial germ cell. His laboratory is interested addressing how germ cells form and migrate in birds and to develop advanced gene targeting techniques for avian germ cells.