Stephen Downes

This point has been made before, but it bears reiterating: the bulk of teaching at a university is done not by professors who lavish person al attention on their stgudents, but by underpaid and overworked graduate students or contract teachers. This article is a pretty good restatement of the position, though the second-last paragraph, which talks about online coyurse completion rates, is out of place in the column and looks like it was added after the fact by an editor.