Apfentaler read his Sentences at the University of Vienna in October 12, 1420. Thomas Ebendorfer will mention him in his Principia in 1421 as: reverendo magistro meo Georio Apphentaler, baccalario in theologia. He will be licensed in 1432 under Thomas Ebendorfer.
Cf. W.J. Courtenay,
« From Dinkelsbül’s Questiones Communes to Vienna Group Commentary. The
Vienna ‘School’, 1415-1425 », in ed. M. Brînzei, Nicholas of Dinkelsbühl and the Sentences at Vienna in the Early XVth
century, Turnhout 2015, pp. 267-316, esp. 272, 281, 286, 287, 289, 300.