Svami Yogeshvarananda Sarasvati ji Maharaj, was known as Vyasa Deva before he became a Sanyasi. He never revealed his parentage and family as this was common under Hindu Sanyasins. In his early youth he left his home to study under great Gurus and was living a life of extreme austerity, mainly in the Himalayas for purpose of self realisation. His entire life was devoted to the ancient science of Yoga and to impart the knowledge he had gathered from many great ascetics as well as from his own spiritual experiences. He has left behind a vast collection of very well documented books, kept in Yoga Niketan Ashram's library. He left earth in 1985.
Yoga Niketan Trust Muni-Ki-Reti, Ramjhula P.O. Shivanand Nagar, Pin-249192, Rishikesh, India.