Patanjali is the compiler of the Yoga Sutras, which date from around 200 BC. Shyam Ranganathan has an MA in South Asian Studies and an MA in philosophy from the University of Toronto, and wrote a PhD dissertation at York University in analytic philosophy on the topic of translating philosophical texts across languages. His areas of research include Indian philosophy, theoretical ethics and the philosophy of language. He is the author of Ethics and the History of Indian Philosophy. Shyam Ranganathan has an MA in South Asian Studies and an MA in philosophy from the University of Toronto, and wrote a PhD dissertation at York University in analytic philosophy on the topic of translating philosophical texts across languages. His areas of research include Indian philosophy, theoretical ethics and the philosophy of language. He is the author of Ethics and the History of Indian Philosophy.