This article presents the first complete biography in English of the early hadith critic al-Jūzjānī (d. 259/873?), in addition to a thorough analysis of his work Aḥwāl al-rijāl, the earliest Syngramma dedicated to the genre of al-jarḥ wa-l-taʿdīl. Through a detailed examination of al-Jūzjānī's engagement with the opinions of earlier hadith critics, his use of the terms of hadith criticism and his own remarks, this article delineates his conception of the function of hadith, methodological framework and approach to the appraisal of hadith transmitters, arguing that al-Jūzjānī may have been the first and only hadith scholar to methodically incorporate the consideration of transmitters’ conformity to the “correct” doctrines in hadith criticism. His methodological innovation, however, departs from existing convention among ahl al-ḥadīth. As a result, although al-Jūzjānī's authority as a hadith critic was well recognized, his approach failed to appeal to succeeding contributors to hadith criticism.
