The Rev. Professor Paul Avis 
Becoming a Bishop [PDF ebook] 
A Theological Handbook of Episcopal Ministry

Why Bishops? What”s so special about Bishops? What are Bishops called to and how best can they do it? This book is the single resource of answers to all the questions one could conceivably have about what a Bishop is and their function and purpose in the Church.
Paul Avis offers a fascinating account of the ministerial identity of the bishop, and in particular the tasks and roles of episcopal ministry. Placing the Bishop within his wider ecclesiological framework, Avis illuminates the role of the individual in episcopal ministry. The book sets the vital work of a Bishop within an ecclesiological framework: the Bishop in the Anglican Communion, within the Church of Christ, within the purposes of God.