19th century, Christianity (Christian Apologetics in Antiquity, Constantine the Great, Formation of NT Canon, Gnosticism, Gospel of Judas, Nag Hammadi, the Arian Controversy), Church history (Egyptian Church history, Gnosticism, Manichaeism, Syriac texts in Manichaean script, Syrian Church history), Fathers of the church (Coptic and Syriac literature, heresiology, Titus of Bostra)