 His most significant ecumenical achievement as CDF Prefect was the Joint Declaration on the Doctrine of Justification signed with the Lutheran World Federation in 1999.Bishop George Anderson, head of the Evangelical Lutheran Church of America, publicly acknowledged that it was ‘Ratzinger who untied the knots’ when it looked as though the document would be shipwrecked by officials from the Pontifical Council for Promoting Christian Unity.Cardinal Ratzinger got the agreement back on track by organising a meeting with the Lutheran leaders at his brother’s house in Regensburg.