If I were him, I would have put it in at the end, but I would have included what they did even if he didn't say he worked WITH them.
What they did was very important- and as an economist I would say that they deserve to be included in the history of dealing with this massive debt problem
But apparently, he left them out on purpose so as not to be associated with Occupiers (according to them) http://blog.debtcollective.org/whos-afraid-of-occupy-hbos-jo...