From the Netherlands Poiret went on to Hamburg, still in quest of Antoinette Bourignon, was completely won by her at the first meeting, and until her death in 1680, he was her faithful disciple. He accompanied her in her wanderings, traveled several times as far as Holstein in connection with her exceedingly confused affairs, and returned to Amsterdam to see to the publication of her complete works, to which he prefixed a thoroughgoing defense of her and added a translation of the Göttliche Gesicht of Hans Engelbrecht, the Brunswick enthusiast. He defended her character and divine mission in a "Mémoire touchant la vie de Mlle. A. Bourignon" (1679), and championed her cause against Bayle and Seckendorf. He was also a warm admirer of Jane Lead. In 1688 he settled at Rijnsburg, where he busied himself on his own works and in multifarious labors for the Dutch booksellers, such as in the Dutch edition of Thierry Ruinart.