Mohammad Javad Zarif, the Iranian foreign minister, is the man at the centre of Tehran's historic agreement on its nuclear programme.
The Islamic Republic has agreed to restrict its nuclear activities in exchange for a partial lifting of sanctions but says its ultimate goal is a permanent solution that would allow it to pursue a peaceful programme.
But there are sceptics - the Israelis describe the agreement as a "historic mistake" and many Arab countries - in particular Saudi Arabia - are worried Iran is simply trying to buy time.
Error
Sorry, your comment was not saved due to a technical problem. Please try again later or using a different browser.