Aulagnier was expelled from the Society of Saint Pius X in 2004, for having supported the agreement between the Personal Apostolic Administration of Saint John Mary Vianney and the Vatican, going against his superiors. He subsequently helped found the Institute of the Good Shepherd in 2006.[2] One of the terms in the founding of the Institute of the Good Shepherd that was authorized by the Vatican was to exclusively use the Tridentine Mass and for the organization to oppose many of the reforms of the Second Vatican Council.[3]
In June 2019, Aulagnier bought the Saint-Paul convent in Thiviers in Périgord, abandoned for 20 years, to create a house for spiritual retreats and a training center for pre-seminarians who are part of the Institute of the Good Shepherd.[4]
Fr. Aulagnier often made statements criticizing democracy and defending monarchies. While still associated with the Society of Saint Pius X, Fr. Aulagnier was quoted in a SSPX periodical in 2001 while serving in a parish in Belgium (which is constitutional monarchy) that "I am pleased to be in Brussels – I who detest the republic and hate democracy."[6]