 But Humboldt did not labor by himself in isolation, as some of his interpreters have claimed to this very day, but communicated with and entertained lively contacts with leading scholars in both Europe and America: with, for example, Franz Bopp in Berlin, August Wilhelm Schlegel in Bonn, Jean-François Champollion and Jean-Pierre  Rémusat[2]  in Paris, Alexander Johnston in London and Peter S. Du Ponceau and John Pickering in Philadelphia and Boston in the United States. Humboldt himself has utilized and understood his correspondence with the leading scholars of the world as an integral part of his ongoing research work.