Diderot

Many of them—from Denis Diderot and Lawrence Sterne to David Hume and Adam Smith—met in the Paris salon of Baron Thierry Holbach.

According to Diderot's daughter, Mme. Vandeuil, their entire correspondence has been destroyed or lost.

Diderot says "Il lisait et tudiait partout, je l'ai moi-mme rencontr sur les grandes routes avec un auteur rabinnique la main."

Naigeon is certain that it is entirely by Holbach, although it is generally held that Diderot had a hand in it.