AP Photo

He is the mysterious man behind Iran’s nuclear program, the invisible “boss” of the military program at the heart of current Middle East tensions. His name is Mohsen Fakrizadeh, and he's 50 years old. For the past 10 years, this specialist in nuclear physics, who is also a general of a brigade of Pasdarans, the elite branch of the regime's Revolutionary Guard, has overseen all of the different organizations charged with developing a nuclear warhead for Iran.