Johann Kirnberger
Johann Philipp Kirnberger (also Kernberg; 24 April 1721, Saalfeld – 27 July 1783, Berlin) was a musician, composer (primarily of fugues), and music theorist. Kirnberger is known today primarily for his theoretical work Die Kunst des reinen Satzes in der Musik (The Art of Strict Composition in Music, 1774, 1779). The well-tempered tuning systems known as Kirnberger II and Kirnberger III are associated with his name, as is a rational version of equal temperament.
