A Swiss Lutheran minister who became an occultist and
Spiritualist, and a friend of French occultist Éliphas Lévi. In
the anti-clerical hoax of Léo Taxil (Gabriel Jogand-Pagès),
Walder and Miss Sophia Walder were represented as associates
of Freemason Albert Pike in the rites of devil worship in
Charleston, South Carolina. In reality, Walder was an earnest
Freemason and mystic.