Vyasa (Devanagari: व्यास, vyāsa) is a central and revered figure in most Hindu traditions. He is also sometimes called Veda Vyasa (वेद व्यास, veda vyāsa), (the one who classified the Vedas into four parts) or Krishna Dvaipayana (referring to his complexion and birthplace). He is the author as well as a character in the Mahabharata and considered to be the scribe of both the Vedas, and the supplementary texts such as the Puranas. A number of Vaishnava traditions regard him as an Avatar of Vishnu. Vyasa is sometimes conflated by some Vaishnavas with Badarayana, the author of the Vedanta Sutras. Vyāsa is also considered to be one of the seven Chiranjivins (long lived, or immortals), who are still in existence according to general Hindu belief. He is also the fourth member of the Rishi Parampara of the Advaita Guru Paramparā of which Adi Shankara is the chief proponent.
The festival of Guru Purnima, is dedicated to him, and also known as Vyasa Purnima as it is the day, which is believed to be his birthday and also the day he divided the Vedas.
Read more about Vyasa: In The Mahabharata, Veda Vyasa, Author of The Mahābhārata, In The Puranas, In Buddhism, Vyas in Sikhism, In The Arthashastra, Author of Brahma Sutra, Author of Yoga Bhashya