Interesting article on Brennan from 2015. It appears few people are comfortable opposing him. That's pretty telling.
>Of the dozens of former and current government officials I reached out to, men and women from both the Bush and the Obama administrations, few seemed to have a handle on him. Some saw him as strong and principled, a warrior-priest who could do no wrong. Others saw him as a yes-man who sucked up to power and got lucky.Several former colleagues, particularly in the CIA, refused to talk about him. He is vindictive, one explained through an intermediary: “He’ll come after me.” Another initially agreed to chat and then emailed me back a few days later, writing, “Unfortunately, I learned today that, because of my active security clearances and continuing work with the intelligence community, it would be best for me to decline your offer of an interview.”
https://www.buzzfeed.com/gregorydjohnsen/how-cia-director-john-brennan-became-americas-spy-and-obamas>Unfortunately, I'm having a bit of trouble atm finding something definitively linking him to SES psyops, the SES also remaining as mysterious as possible. 