"Hesham ibn Hakam was one of the greatest followers of Imam al-Sadiq [a] and a pious man and an expert on Islamic laws."
Hesham was one of the closest helpers of the 6th Imam [a] and the 7th Imam and had discourses with his opponents on the basic principles and the other religious matters. He was alive for sometime even after the death of the 7th Imam [a].
"Hesham is respected and of a high rank and reliable in quoting Hadith (tradition)". "There was a group of brilliant students of the Holy Family and Shi'a Imams who were outstanding in speculative theology (Ilm-Kalam) due to their skilfulness, proficiency and reasoning power like Hesham ibn Hakam and..."
Hesham has many writings, discourses and books on the topics of Imamate and speculative theology. The contemporary scholars of Hesham have counted him as the greatest defender of "Wilayah" (trusteeship) and the honour of Shi'a (i.e. eye and face). The "eye of the Shi'a" (Ain-al-Taefe) in the sense that he was a watchful and vigilant protector against the deeds of the opponents. He did not neglect the smallest impudent act of the opponents against the exalted rank of "Wilayah" and did not leave even the least objections unreplied against "Imamate".
He was called "the face of Shi'a" (i.e. Wajh-al-Taefe) in the sense that anyone from among the opponents of the Shi'a who used to confront him either surrendered, converted or became fearful and refused to discuss and argue with him. Hesham used to say, "I wonder why the opponents of the Shi'a chose the man as caliph whose dismissal came from heaven and dismiss the man whose appointment came from heaven; and quoted the story of the verse Bara'at for justification."
 Sheikh Mufid, Tanqih al-Maqal- quoted from the writings of Marhum Majlisi.
 Khalesah by Allamah Helli.
 "Rejal" by Sheikh Tousi.
 A'yan a-Shiah by Allamah Syed Mohsen Amili, Part 2. Vol. 1. P.6.
 Fehrist Ibn Nadim - (Hesham has indicated in his speech that after the inspiration of the verses of the chapter Barayat, (Immunity) the Prophet should first hand them to Abubakr to take to Mecca and recite at the Hajj gathering. And then by the order of God, Prophet (s.a.w.) was to take the verses back from him and give them to Amir al-Mu'minen, who then took the verses to Mecca and recited them during the Hajj season.