Professor Birger Pearson (University of California) delivered a talk, in October 2011 at the Sacred Heart Jesuit Retreat House in Sedalia, Colorado, on Gnosticism, with a special focus on Sethian Gnosticism and the Apocryphon of John.
Apocryphon of John
Zlatko Plese on the Gnostic Myth, Apocryphon of John
On May 21, 2014, Professor Zlatko Plese (University of North Carolina- Chapel Hill) lectured on the Gnostic myth, with special reference to the Apocryphon of John and including discussions of negative theology and Sophia.
Zlatko Plese is the author of Poetics of the Gnostic Universe: Narrative and Cosmology in the Apocryphon of John (Brill, 2006).
Biblical Studies Online 