The students protesting Mr Koh are right to try to hold him to account for the government's actions during his time of government service. The revolving door between elite academia and the higher levels of government is defensible only insofar as the inside knowledge of former bureaucrats is used to better educate students. Mr Koh ought to be judged by more than the single issue of American drone strikes. However, that issue is an important one. A fuller public accounting of his own role would go a long way towards making the case that the compromises necessitated by government service left him not only more eminent, but also wiser.