Dr Gennery is Professor in Paediatric Immunology and Haematopoietic Stem Cell Transplantation at the University of Newcastle upon Tyne and Honorary Consultant for the Northern Supra-Regional Bone Marrow Transplant Unit for SCID and related disorders, at the Great North Children’s Hospital, Newcastle upon Tyne, clinically qualified and active. He spent a year of post-doctoral studies working with Anne Durandy and Alain Fischer in the Necker Hospital in Paris and was involved in the discovery of Cytidine Deaminase one of the first genes to be discovered involved in class switch recombination and somatic hypermutation. He has been a consultant in Newcastle for 19 years. His research interests include immunoreconstitution following haematopoietic stem cell transplant for primary immunodeficiency, long-term outcomes of transplantation for primary immunodeficiency (and in particular Chronic Granulomatous Disease and Severe Combined Immunodeficiency), DNA repair disorders and their appropriate treatment and Di George Syndrome. More recently, he has adapted new methods of T cell depletion for patients with primary immunodeficiency, and established extracorporeal photopheresis for the treatment of children with graft versus host disease. He is exploring the use of defibrotide for treatment of non-VOD endothelial cell activation disorders post-HSCT. He is a member of ESID and EBMT, recently chaired the ESID/EBMT Inborn Errors Working Party group and the ESID Clinical Working Party and ERN-RITA Guidelines Working Party. He is Co-chair of CIBMTR Primary Immune Deficiencies, Inborn Errors of Metabolism and other NMMD Working Committee. He has published over 370 papers on primary immunodeficiency, has co-authored important multi-centre publications on the outcomes of cohorts of children with rare primary immunodeficiencies following HSCT, and contributed to relevant chapters in several major textbooks.