Cardinal Karl-Josef Rauber, former Apostolic Nuncio, was born in Nürnberg, in the diocese of Bamberg, Germany on 11 April 1934.
In 1950 he obtained a diploma from the St. Michaels-Gymnasium of the Benedictine Order in Metten. He then studied theology and philosophy at the University of Mainz.
He was ordained a priest in the Cathedral of Mainz on 28 February 1959.
In 1962 he transferred to Rome, where he obtained a doctorate in canon law from the Pontifical Gregorian University, and he entered the Pontifical Ecclesiastical Academy.
On 1 October 1966 he entered the diplomatic service of the Holy See and worked at the Secretariat of State until 1977 eventually becoming responsible for the German section. He subsequently worked in the apostolic nunciature in Belgium, Luxembourg and Greece.
On 18 December 1982 he was appointed as Apostolic Pro-Nuncio in Uganda and assigned the titular see of Iubaltiana. He received episcopal consecration on 6 January 1983. Following his mission in Uganda, in January 1990 he was nominated president of the Pontifical Ecclesiastical Academy.
On 16 March 2003 he was appointed as apostolic nuncio in Switzerland and in Liechtenstein.
On 25 April 1997 he assumed the role of apostolic nuncio in Hungary and Moldova.
On 22 February 2003 he was appointed as apostolic nuncio in Belgium and in Luxembourg, concluding his mandates in June-July 2009.
Created and proclaimed Cardinal by Pope Francis in the consistory of 14 February 2015, of the Deaconry of Sant’Antonio di Padova a Circonvallazione Appia (St. Anthony of Padua at Circonvallazione Appia).