Wigand Siebel (born 4 January 1929 in Freudenberg, Westphalia, died 29 August 2014) was a German sociologist.
The following is his academic timeline:[2] He is the Emeritus Professor of Sociology at the University of Saarland.
Siebel was raised an Evangelical Protestant and converted to Catholicism a short time before Vatican II.
As a Conservative Christian, he became involved with the Catholic Traditionalist movement resisting the adoption of the Modernist ideas into Catholicism as a result of the Aggiornamento and Vatican II.
The French Traditionalist priest, George de Nantes wrote in his The Catholic Counter-Reformation in the XXth Century, #220, June 1989, page 20, para 1 & 2 that Wigand Siebel and his followers teach that, with the Modernist apostasy, the Catholic Papacy has ceased to be or that it has come to an end, a teaching which contradicts Catholic teaching that is strongly emphasised.