Since graduating with a BA in History and Politics in 1993, Brian McCarthy has been engaged in the study of the history of the Garda Siochana. On completing an MA in History, he continued his research into the history of the force and in 2008, he was conferred with a PhD at University College Dublin following the submission of a thesis entitled A history of the provision and reform of probationer education and training in the Garda Siochana, 1922-2007.

He is currently a career guidance counsellor at St. Peters College, Dunboyne, County Meath.