Johann Christian August Clarus (5 November 1774, Buch am Forst near Coburg – 13 July 1854, Leipzig) was a German anatomist and surgeon.
In 1798 he obtained his medical doctorate from the University of Leipzig, where from 1803 to 1820, he served as an associate professor of anatomy and surgery. From 1820 to 1848 he was a professor of clinical medicine at the university as well as senior physician at Jacobshospital in Leipzig. In 1840/41 he served as university rector. From 1848 onward, he worked in his private medical practice.[1]
On 24 August 1821, he was called upon to write a report on the mental condition of confessed murderer Johann Christian Woyzeck (1780–1824). After meeting with Woyzeck, Clarus maintained that he was accountable for his actions, despite the fact that he suffered from hallucinations. Later on, he was asked to write a second report. He met with Woyzeck several more times, and reached the same conclusion as in his initial report. Clarus' writings on the mental state of Woyzeck were published with the title "Die Zurechnungsfähigkeit des Morders Johann Christian Woyzeck" and subsequently used as a source by dramatist Georg Büchner for the stage play "Woyzeck".[2] [3]