It was Jim Dao, the deputy editorial page editor:
Dao will be reassigned to a position in the newsroom.
If Bennet genuinely never read the op-ed, it could be interpreted as a measure of the trust he had in Dao, but also it is evidence that the NYT is just too big and cumbersome to maintain its brand. The editorial page director should have time to have a careful look over everything that appears in the editorial pages. (Hell, the editor in chief should have time for that.) If not, it is time to start sacking the staff op-ed columnists (start with Douthat and Stephens please) and running fewer guest editorials.
I doubt the editorial page director of a good smaller newspapers (eg, the Mercury News) delegates this responsibility.
