Canon Jeffrey John will be installed as Dean of St Albans Cathedral in July.
Canon John, who is at present Southwark Cathedral's Canon Theologian, will take up his duties as Dean and Rector of the Cathedral parish on Friday 2 July.
The official farewell at Southwark is expected to take place within the next few weeks.
The Dean of Southwark says: "Southwark is the poorer for his going, but richer for having had him with us so long."
The time of the installation service on 2 July and the arrangements for obtaining tickets will be announced shortly.
For the latest local news and events direct to your inbox every Monday, you need our weekly email newsletter SE1 Direct.
7,000+ locals read it every week. Can you afford to miss out?
Read the latest issue before signing up