 As late as 1988, recountings of the stories of castaways in English still claimed his name was unknown.In 2002 a Dutch book "Een Hollandse Robinson Crusoë" was published, written by the Dutch historian Michiel Koolbergen (1953–2002) after he had done many years of research in Dutch and British archives; Koolbergen died before its publication.Koolbergen had identified the castaway as 'Leendert Hasenbosch' by his work in archives; Koolbergen was aware of all English versions of the diary except that of 1726.