His book "Adults in the Room" is a great read, he basically shows how the politicians were playing politics (e.g. the Spanish finance minister admitting to him in private that what Greece wanted was reasonable, but if the (conservative) Spanish government agreed to what the Greek government wanted, the socialists in Spain would've seized that and went with it in the upcoming Spanish elections. There's even an appendix about why he/his government wasn't bluffing with a Game Theory explanation.