Vyasa

Vyasa (, , literally “Compiler”) is an important figure in most Hindu traditions. He is sometimes called Veda Vyāsa (वेदव्यास, "veda-vyāsa", "the one who classified the Vedas") or Krishna Dvaipāyana (referring to his complexion and birthplace). He is the author of the "Mahabharata". He is also a character in it. He is considered to be the scribe of both the Vedas and Puranas. According to Hindu beliefs, Vyasa is an avatar of the god Vishnu. Vyasa is also considered to be one of the seven Chiranjivins (long lived, or immortals), who are still in existence according to Hindu belief.
Vyasa lived around the 3rd millennium BCE. The festival of "Guru Purnima" is dedicated to him. It is also known as "Vyasa Purnima", for it is the day believed to be both his birthday and the day he divided the Vedas.
In the Mahabharata.
Vyasa appears for the first time as the compiler of, and an important character in, the "Mahabharata". It is said that he was the expansion of the god Vishnu who came in Dwaparayuga to make all the Vedic knowledge available in writing which was available in only in spoken form at that time. He was the son of Satyavati, daughter of the fisherman Dusharaj, and the wandering sage Parashara. He is credited with being the author of the first Purana, Vishnu Purana). Vyasa was born on an island in the Yamuna river. There are two different views regarding the place of his birth. One of the views suggests that he was born in the Tanahun district in western Nepal. Another view suggests that he was born on Island in Yamuna river near Kalpi, Uttar Pradesh, India. Vyasa had a dark complexion and may be called by the name "Krishna" (black), and also the name "Dwaipayana", meaning 'island-born'.