You may not have heard of his name and, thanks to his no-show at the tribunal, you cannot view his photograph. But even in his absence Mr John Caldwell indisputably has a "pervasive presence" at this tribunal, to borrow a phrase used yesterday by tribunal lawyers.
You can tell Mr Caldwell's importance to the matters before the tribunal from the roll-call of his business contacts, which includes Brennan and McGowan, Frank Dunlop, James Kennedy and Liam Lawlor.
Mr Lawlor was the last witness who failed to answer a summons from the tribunal, an action which earned him a week in jail. Now Mr Caldwell is facing a similar threat of High Court action, as well as a possible prosecution by the DPP.
But, in contrast to the TD, he has taken concerted action to move beyond the reach of the tribunal. He may be able to stay there, too; it seems likely that he holds British citizenship, by virtue of his origins in Belfast.
For an ordinary citizen to cock a snook at the tribunal in such a deliberate fashion would be surprising; for one of Dublin's leading solicitors to do so is simply astonishing.
Mr Dunlop once introduced Mr Caldwell to RT╔'s Charlie Bird as the "owner" of lands at Carrickmines which were then the focus of a controversial rezoning. A few weeks after Mr Dunlop gave his dramatic evidence about payments to politicians in May 2000, the tribunal contacted Mr Caldwell for the first time. For now, the large gates of Mr Caldwell's mansion remain firmly shut. However, this tribunal has already shown its persistence - just ask Liam Lawlor.