Debbie is an internationally recognised expert and speaker on genetic genealogy. She writes the popular Cruwys News blog, and is the author of two books: DNA and Social Networking and The Surnames Handbook. She is an Honorary Research Associate in the Department of Genetics, Evolution and Environment at University College London, and has worked to promote the responsible use of DNA testing as a genealogical tool. She is a member of ISOGG and the co-founder of the ISOGG Wiki. She is the administrator of several projects at Family Tree DNA including the Cruwys/Cruise DNA Project, the Devon DNA Project and the mtDNA Haplogroup U4 Project.