 Undoubtedly, as İlber Ortaylı has suggested, the 19th century, especially the period starting from Tanzimat (Reorganization) to the end of the Empire, was the “longest century” of Ottoman history. This article examines the life and works of a leading Ottoman bureaucrat of this late period, Ali Fuat Türkgeldi. He hailed from a bureaucratic family in which his grandfather Celal Bey had been a Tanzimat bureaucrat and his father a top official in the Translation Office. Ali Fuat Türkgeldi's works provide an important analysis of this historical period. They are examined in this article together with an unpublished biography written by his son Âli Türkgeldi, who served as the Turkish Republic’s ambassador to, among other countries, India and Brazil. Ali Fuat Türkgeldi was well known for his courageous opposition to the imperial decree drawn up by the cabinet of Damad Ferid which declared Kuvây-ı Milliye a rebel force in 1919. In the last section of the article the detailed curriculum vitae written by his son is given in Latin transcription