Soldier, antiquary, genealogist, wine exporter.
His correspondence with Franklin largely concerned the wine business.
An Irish expatriate in France, O’Gorman joined the Irish brigade of the French army about the time of his marriage, distinguished himself, and was made a chevalier.
Returned to Ireland as a result of the French Revolution (1793).
Born in Castletown, County Clare, Ireland. Married c. 1750 to a daughter of the Count d’Eon; at least three sons.