starting in 1965 he became a fellow at the department of far eastern history, australian national university (1965–67). he made a research trip to europe (1966–67). he published a translation of "the secret history of the mongols" in eleven volumes of "papers on far eastern history" (1971–1985). he became a senior fellow of the division of pacific and asian history at the australian national university (1967–94), a research-only fellowship. he completed projects by prominent mongolists antoine mostaert and henri serruys after their deaths. he was a visiting professor at the university of rome three times (1996, 1999, 2001). in 2004 he published his translation of the "secret history" with brill; it was selected by "choice" as outstanding academic title (2005) and is now in its second edition. in 2007 he donated his personal library of around 6000 volumes to the scheut memorial library at the katholieke universiteit leuven. late in his life de rachewiltz was an emeritus fellow in the pacific and asian history division of the australian national university. his research interests included the political and cultural history of china and mongolia in the thirteenth and fourteenth centuries, east-west political and cultural contacts, and sino-mongolian philology generally. in 2015, de rachewiltz published an open access version of his previous translation, "the secret history of the mongols: a mongolian epic chronicle of the thirteenth century," that is a full translation but omits the extensive footnotes of his previous translations.