Debbie is an avid genealogist who has been researching her family tree for over a decade. She has written two books for the History Press: DNA and Social Networking (2011) and The Surnames Handbook (2012). Debbie is an Honorary Research Associate in the Department of Genetics, Evolution and Environment at University College London. She is a member of ISOGG and the co-founder of the ISOGG Wiki. She runs the Cruwys/Cruse/Cruise one-name study through the Guild of One-Name Studies, and is the administrator of the associated surname project at Family Tree DNA. She is also the administrator of the Devon DNA Project and the mtDNA Haplogroup U4 Project. She writes the popular Cruwys News blog.