Marie Cahill was born in County Clare in the West of Ireland and is the founder of Oak Ancestry. She is an experienced genealogist having carried out research for clients of the Irish Ancestry Research Centre. She is an affiliate member of the Accredited Genealogists of Ireland having carried out extensive research for those with ancestors from all corners of Ireland. Marie has also been involved with digitization projects for Clare County council, Clare library and the Clare Heritage and Genealogy Research Centre.

Her genealogical and historical studies have covered many areas of Irish Ancestry Studies and she holds a Masters Degree in the History of Family from the University of Limerick.