 In the early twentieth century, German-American scholars embraced him and the University of Pennsylvania professor Marion Dexter Learned (1857–1917) wrote a lengthy biography; Learned had access to papers that have subsequently been lost.In 1985 John Weaver documented the cultural background of Pastorius' childhood and youth, and his reasons for emigrating to Pennsylvania in 1683.More recently Princeton University professor Anthony Grafton has written about Pastorius as a representative of European intellectual culture.