John McGrath is a Co-founder of Replay’s product company utilizing HSV’s ability to deliver big DNA in the skin. He is Professor of Molecular Dermatology and Head of the Genetic Skin Disease Group. He is also an honorary Consultant Dermatologist for the Guy’s and St Thomas’ NHS Foundation Trust. He qualified from Guy’s Hospital in 1985 and trained in dermatology and dermatopathology at St John’s Institute of Dermatology in London. His research background is in electron microscopy and molecular biology. He is a recent President of the European Society for Dermatological Research and currently serves on the editorial board of 9 international journals, including being the section editor for genetics for the Journal of Investigative Dermatology. Since August 2018, he has been the Head of St John's Institute of Dermatology.