Jonah Barrington called him a "very excellent private character" but did not rate his judicial qualities at all highly. According to Barrington, Henn was "dreadfully puzzled" when he was hearing a case while on
assize at
Wexford in about 1789 by the arguments of two young barristers, each of whom pleaded with great eloquence that the law was in his client's favour. Having argued their contradictory positions at length, they requested the judge to give his ruling. Henn, at a loss to know which side was in the right, whispered to his
registrar: "I wish to God I knew what the law really was!", to which the registrar replied that if he knew what the law was, he would happily share his knowledge with the judge.
John Scott, 1st Earl of Clonmell, who presided in the King's Bench where Henn was a junior judge, had a very low opinion of him, calling him "at best a fool". Admittedly Scott in his
diary privately expressed his contempt for nearly all the Irish judges of his time, including some with whom he was outwardly friendly: Henn's cousin John Bennett was one whom Scott saw as his particular enemy. == Family ==