Dr. Toshihiro Wada is Professor of Indian Philosophy at Nagoya University, Japan. He received a PhD degree from the University of Poona in 1988 and a DLitt degree from Nagoya University in 2002. He published Invariable Concomitance in Navya-Nyaya in 1990, The Analytical Method of Navya-Nyaya in 2007, and A Navya-Nyaya Discussion on the Meaning of the Negative Particle NaN: A Study of the Nanvadakarika of Udayana (co-authored) in 2013. He also contributed papers to Journal of Indian Philosophy, Asiatische Studien, Indologica Taurinesia, Nagoya Studies in Indian Culture and Buddhism: Sambhasha, and so forth.