Who among these sahabah presided over compilation of Al-Qur'an?

The compilation of the Qur'an was primarily presided over by Zayd ibn Thabit.

Zayd ibn Thabit was a young companion of the Prophet Muhammad and had a reputation for being very knowledgeable and trustworthy. He was chosen by the first caliph after the Prophet's death, Abu Bakr, to lead the task of compiling the Qur'an into a single written form. This decision was made due to the concern that many of those who memorized the Qur'an were dying in battles, and there was a risk of parts of the Qur'an being lost.

Zayd had previously served as one of the scribes for Prophet Muhammad, meaning he was already familiar with the Qur'anic revelations as they occurred during the Prophet's lifetime. Abu Bakr instructed Zayd to gather all the pieces of the Qur'an that were written down or memorized, verify them, and compile them into a unified document. This effort ensured the preservation of the Qur'an for future generations and was a monumental achievement in Islamic history.

Later, during the caliphate of Uthman ibn Affan, Zayd ibn Thabit also played a significant role in creating standardized copies of the Qur'an to ensure uniformity and avoid variations or discrepancies. This effort led to the production of the "Uthmanic Codex," which serves as the reference for Muslims even today.