Aka Padmaśrījñāna, Padmapaṇḍita. He lived during the first half of the 2nd millennium CE.
Daud Ali, Padmaśrī's Nāgarasarvasva and the World of Medieval Kāmaśāstra, Journal of Indian Philosophy, online first (Springerlinks), 2011.
Siegfried Lienhard, Observations Concerning a Buddhist Text on Erotics: the Nagarasarvasva of Padmaśrī, Central Asiatic Journal (Wiesbaden), vol. 23, nos.1-2 (1979), pp. 96-103.