John, often called “the godfather of Irish genealogy”, is a presenter of the hit RTE TV show The Genealogy Roadshow.

He’s also the author of the standard guide to Irish genealogy, Tracing your Irish Ancestors.

John was Project Manager with the Irish Genealogical Project from 1991 to 1995 and later went on to develop and market his own genealogical software, “Grenham’s Irish Recordfinder”. Since 1998, he has run the Irish Times “Irish Ancestors” website.

In 2005, he was the first Genealogist-in-Residence at Dublin City Library. He was awarded a fellowship of The Irish Genealogical Research Society in 2007 and of the Genealogical Society of Ireland in 2010.

His publications include Clans and Families of Ireland (1995), Generations (1996), “The Genealogical Office and its Records” in The Genealogical Office , (1999), Grenham’s Irish Surnames (CD-ROM, 2003) and numerous articles and columns in the UK magazine Your Family Tree. He has written the “Irish Roots” column and blog in The Irish Times since February 2009.

In 2011, along with Irish Times Training, he developed and launched an online genealogical course.