The creator of the Birds Way to "enlightenment" left the body in 1936 at only 48. Primarily known as the guru of Nisargadatta and Ranjit Maharaj, this book includes most of his teachings and is a contemporary and accessible source of the best of advaita vedanta. There is a bit much on the importance of the Sadguru and the work of Samartha Ramdas' book Dasbodh but I have not found a more practical path to Turya and applied advaita rather than academic advaita. Highly recommended.