The name of Metropolitan John (Zizioulas) came up in discussion on one of the other threads. He is well known in the West for his book Being as Communion, which is a difficult read. There is, however, a remarkable resource available in English from his lectures at the University of Thessaloniki. I would commend it to anyone who is a serious student of theology and wanted to form an opinion of Zizioulas’ work beyond the one work available in English. The site is available here.