Bhagavan Veda Vyasa

Vyasa:
Vyasa is traditionally known as author of this epic. But he also features as an important character in it. His mother later married the king of Hastinapura, and had two sons. Both sons died without an issue and taking recourse to an ancient practice called Niyoga where a chosen man can father sons with the widow of a person who dies issueless, she requests Vyasa to produce sons on behalf of her dead son Vichitravirya.

Vyasa fathers the princes Dhritarashtra and Pandu by Ambika and Ambalika, the wives of the dead king Vichitravirya. Vyasa told them that they should come alone near him. First did Ambika, but because of shyness and fear she closed her eyes. Vyasa told Satyavati that her child would be blind. Later this child was named Dhritarāshtra. Thus Satyavati sent Ambālika and warned her that she should remain calm. But Ambālika's face became pale because of fear. Vyasa told her that child would suffer from anaemia, and he would not be fit enough to rule the kingdom. Later this child was known as Pāndu. Then Vyasa told Satyavati to send one of them again so that a healthy child can be born. This time Ambika and Ambālika sent a maid in the place of themselves. The maid was quite calm and composed, and she got a healthy child later named as Vidura. While these are his sons, another son Śuka, born of his wife, sage Jābāli's daughter Pinjalā (Vatikā),[5] is considered his true spiritual heir. He was thus the grandfather of both the warring parties of the Mahābhārata, the Kauravas and the Pāndavas. He makes occasional appearances in the story as a spiritual guide to the young princes.

In the first book of the Mahābhārata, it is described that Vyasa asked Ganesha to aid him in writing the text, however Ganesha imposed a condition that he would do so only if Vyasa narrated the story without pause. To which Vyasa then made a counter-condition that Ganesha must understand the verse before he transcribed it.

Thus Lord VedVyas narrated the whole Mahābhārata and all the Upanishads and the 18 Puranas, while Lord Ganesha wrote.

Vyasa is supposed to have meditated and authored the epic by the foothills of the river Beas (Vipasa) in the Punjab region

Source: wikipedia