Student of Phywa pa Chos kyi seng ge (1109-1169) whose biography he authored. A brief biography of him appears in Gangs can mkhas grub, p. 1336.
Bibliography:
Tshad ma rnam par nges pa'i ti ka legs bshad bsdus pa.
Leonard W.J. van der Kuijp, An Introduction to Gtsang-nag-pa's Tshad-ma rnam-par nges-pa'i ti-ka, an Ancient Commentary on Dharmakīrti's Pramāṇaviniścaya, Otani University Tibetan Works Series vol. 2 (Kyoto 1989), pp. 1-33.
