Mohammad Hosseini Beheshti ( Persian : محمد حسینی بهشتی ; 24 October 1928 – 28 June 1981) was an Iranian jurist, poetic philosopher, cleric and politician who was known as the second person in the political hierarchy of Iran after the Revolution . Beheshti is considered to have been the primary architect of Iran's post-revolution constitution, as well as the administrative structure of the Islamic republic . Beheshti is also known to have selected and trained several prominent politicians in the Islamic Republic, such as former presidents Hassan Rouhani and Mohammad Khatami , Ali Akbar Velayati , Mohammad Javad Larijani , Ali Fallahian , and Mostafa Pourmohammadi . Beheshti also served as the Secretary General of the Islamic Republic Party, and was the head of the Iranian judicial system . He further served as Chairman of the Council of Islamic Revolution , and the Assembly of Experts . Beheshti earned a PhD in philosophy, and was fluent in English , German and Arabic .