[2][3] His father, Mirza Bagher Khan Sadigoddoleh, was from the residents of Nur, Mazandaran; his mother, Malakeh Khanum, was a Qajar princess, known as "Shajan".

His family had moved to Tehran years before the birth of Sadighi and settled in Oudlajan, which was, at the time, one of the high-class neighbourhoods of the capital.

[3] Although his aristocratic family sought other dreams for him and his father was not inclined for his son to follow painting,[4] Sadighi's excessive interest in painting and designing made him quit studying in the last year of school and go to Kamal-ol-molk Ghaffari with his friend Ali Mohammad Heydaryan and get attend Ghaffari's class at his School of Fine Arts.

After three years of studying, he achieved a high-class diploma in 1920 and started teaching students as a mentor at the same school.

Ghaffari initially disagreed and believed Sadighi's tools and experience insufficient, but eventually approved it and accepted the expenses of the stone.

By the departure of the mentor, the protégés and teachers scattered and one year later on 1928, Sadighi went from Tehran to Astara and from there to Baku and Moscow and eventually France.

He traveled across some European countries for some time and continued learning and gaining experience in sculpture and stone-cutting under Angealberr at Paris National Fine Arts High School for four years.

Having gained permission from Ghaffari, who was in a self-imposed exile, and by the help of his friend and old classmate, Ali-Mohammad Heydaryan, he established the School of Fine Arts again.

[9] During the 1979 revolution, Khayyam's statue received critical damage and its face and fingers broke as a result of stones thrown at.

Michelangelo is once again born in the east.Abolhassan Sadighi has collectively formed 83 statues, from which those having accurate information have been mentioned in this list; in addition he had sculpted statues of contemporary famous people, including Reza Shah, Mohammad Reza Shah and Taqizadeh (then representative of Majlis), Doctor Habibi (one of the directors of agriculture school), Bayat, Kashefossaltaneh (which is in Lahijan), Karim Sa'I, Imam-Quli Khan (governor of Fars at the time of Shah Abbas the Safavid) in the central square of Qeshm.

[13] Sadighi has left remarkable works in painting and his portrayals of celebrities of classic Persian literature have made their reputations permanent.

On the same year, a six-member group including Hooshang Seyhoun and Sadighi went to Hamadan to exhume Abu-Ali Sina's grave, and his skull was examined.