Chair for the study of freemasonry as an intellectual current and socio-cultural phenomenon (University of Leiden, the Netherlands)
Cultural Masonic Centre 'Prins Frederik' (The Hague, the Netherlands)
Chair for the history of Hermetic philosophy and related currents (University of Amsterdam, the Netherlands)
Network Dutch Esoteric Collections (the Netherlands)
Bibliotheca Philosophica Hermetica (Amsterdam)
Library & Museum of Freemasonry (London, UK)
ESSWE, European Society for the Study of Western Esotericism
EXESO, Exeter Centre for the Study of Esotericism (UK)
Centro de Estudios Históricos de la Masonería Española (Spain)
Centro de Estudos Maçónicos Fernando Pessoa (Portugal)
