Ali Akbar Salehi, the energetic, English-speaking head of Iran's Atomic Energy Organization, told NBC News in Tehran how the the historic deal between Iran and the United States came to fruition.
During the interview Salehi revealed for the first time some of his country's calculations, preconditions and continued mistrust of Washington.
Salehi, who is also one of Iran's vice presidents, said the country's supreme leader, the Ayatollah Ali Khameini, was involved at every step of the way.
During the NBC News interview Salehi also discussed that Washington initiated the talks and that the Iranians had several conditions, including that the talks should be quick and no fall into lethargy.
