After his graduation, Siebel worked for the Social Research Center of Dortmund. In 1964, he was appointed a lecturer at the Ruhr University at Bochum. In 1965, he was appointed Professor of Sociology at the University of the Saarlands in Saarbrücken.
The following is his academic timeline:
- Studied in Kiel, Munich and Münster.
- 1955-1959: Fellow at the Institute for Christian Social Sciences in Münster.
- 1955: Received his Doctorate in Political Science at Münster.
- 1955-1959: Publishing Company of Freiburg
- 1959-1964: Fellow of Social Research at the University of Münster in Dortmund.
- 1964: Promotion to academic status in Münster
- Since 1965: Full Professor at Saarbrücken
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 heresy and the junking of 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.