acc. to Klaus-Dieter Mathes its author is probably the tantric Nāgārjuna of the Ārya school; cf. "The Role of the Bodhicittavivaraṇa in the Mahāmudrā Tradition of the Dwags po bka' brgyud (JIATS, no. 5)":http://www.thlib.org/collections/texts/jiats/#!jiats=/05/mathes/#ixzz4KKrTj0Nb (accessed: 2016-09-15)