Indian author, lecturer, and spiritual teacher Ra. K. Rangarajan is often referred to as Ra. Ki. Rangarajan. He has authored a large number of books in both Tamil and English on a variety of subjects, such as spirituality, self-improvement, and personal development. Rangarajan frequently references Hindu philosophy in his publications, especially Advaita Vedanta.
Among the best-selling publications by Ra. K. Rangarajan are "Vetri Nichayam," "Tholkappiyam: The Earliest Grammar of Tamil," "Paartha Gnabagam Illaiyo," "Unnal Mudiyum Thambi," and "Thirukkural: Pearls of Wisdom."
