Fr. John Behr is the Regius Professor of Humanity at the University of Aberdeen. He has a long and prestigious career in early Christian theology and is one of the leading scholars on the Patristics. He has done many translations of the early church fathers. In this conversation we specifically talk about Origen. We mention Karl Barth, Jaroslav Peliko, Metropolitan John Zizioulas, Diodorus of Tarsus, Theodore of Mopsuestia, Gregory of Nyssa, and more. 

Fr. Behr's translation of "On First Principles": https://www.amazon.com/Origen-First-Principles-Oxford-Christian/dp/0198845316/ref=pd_lpo_1?pd_rd_i=0198845316&psc=1 

Irenaeus of Lyons: https://www.amazon.com/Irenaeus-Lyons-Identifying-Christianity-Christian/dp/0199214638/ref=sr_1_1?crid=H1Q18A238CTL&keywords=behr+irenaeus&qid=1646669580&s=books&sprefix=behr+irenaeus%2Cstripbooks%2C112&sr=1-1