Johnjoe McFadden was born in Donegal, Ireland but brought up in the UK. He obtained his PhD at Imperial College London and went on to work on human genetic diseases and then infectious diseases, at the University of Surrey in Guildford, UK. For more than a decade, Professor McFadden has specialised in examining the genetics of microbes such as the agents of tuberculosis and meningitis. He has published more than 100 articles in scientific journals on subjects as wide-ranging as bacterial genetics, tuberculosis, idiopathic diseases and computer modelling of evolution and has edited a book on the genetics of mycobacteria. He has lectured extensively in the UK, Europe, the USA and Japan and his work has been featured in radio, television and national newspaper articles. His present post is Professor of Molecular Genetics at the University of Surrey. He lives in London and is married with a young son.