John has been a Member of AGI since its foundation. His Tracing your Irish Ancestors (5th ed.2019) is the most popular guide book on Irish genealogy, known worldwide. As well as writing several other books, he had a regular column in the Irish Times and he now has a highly regarded blog http://www.johngrenham.com/blog/.
His Irish Ancestors site at https://www.johngrenham.com/ is an important online resource. In 2007 he was awarded the fellowship of the Irish Genealogical Research Society. He was a presenter of the television show The Genealogy Roadshow on RTE in 2011 and 2014. He is a much in demand speaker at conferences around the globe. From 2014 to 2019 he delivered the City Colleges diploma in family history, the precursor of this course.