The man who exposed Provos and Haughey
His towering intellect and power of logic brought home to many people the evil and sectarian nature of the Provisional IRA and their posturing as true republicans.
This was done at a time when it was unpopular to articulate such views and at this remove, with the acceptance of power-sharing in Stormont, the principle of consent and the removal of articles two and three from the constitution, it brings into sharp relief Dr O’Brien’s truly great contribution to Irish society.