(b Kassel, 11 Oct 1847; d Berlin, 18 June 1911). German architect. He was a pupil (1862–6) at the Höhere Gewerbeschule in Kassel where one of his teachers was GEORG GOTTLOB UNGEWITTER who had a considerable influence on him. Hehl then went to England where he stayed until 1869, working for a time in the office of George Gilbert Scott I. From 1869 to 1872 he worked with Edwin Oppler in Hannover where he came into contact with Conrad Wilhelm Hase. In 1872 Hehl started his own office which he ran until 1894. Within a few years his practice had become one of the largest and most important in Hannover. It was at that period that most of the projects attributed to him (estimated at c. 170) were executed; of these c. 60 buildings are known to survive. His many churches, such as the Dreifaltigkeitskirche (1880–83) in Hannover, were especially admired. However, his secular buildings were more numerous; like the churches, they were generally designed as brick buildings using the Gothic Revival repertory of the Hannover school, as promoted by Hase. These included blocks of flats (the Poppe block in Hannover, 1873), large manor houses and villas (e.g. Villa Leonhardi, Minden, 1879–80), imposing detached houses (e.g. Haus Möller, near Bielefeld, 1881) and hospitals and innumerable parsonages. Hehl repeatedly entered architectural competitions, with great success: his design (1893) for the garrison church in Dresden attracted particular attention. Although it was excluded from the assessment for formal reasons, the design nonetheless led to Hehl’s appointment in 1894 to the chair of medieval architecture at Charlottenburg, Berlin. Despite his new commitments Hehl managed to run his own practice in Berlin too, but from then on he limited his building and design work mainly to churches, including the Herz Jesu-Kirche (1897–8) in Berlin.