Student or Learner
He admitted he was haunted by his decision to hire Andy Coulson, the former News of the World editor as Conservative communications director. But he said he sought assurances on his involvement in phone hacking at his former newspapers
Yes, Andy Coulson's. It's not well written since the first "he" in that sentence is the person who hired Coulson and the next 2 "his" refer to Coulson.