The United States and Iran are due to hold their second round of nuclear talks on Saturday, as what both sides are looking for in a deal begins to take shape.

As far as biographies go, the two men in charge of the delicate negotiations between Iran and the United States over Tehran's rapidly advancing nuclear program couldn't be more different. On the American side,

Talks between Iran and the United States over Tehran’s rapidly advancing nuclear program are “in a very crucial” stage