Johann Adam Hiller
Born: 25th December 1728, Germany
Died: 16th June 1804, Leipzig, Germany
Nationality: German
Johann Adam Hiller was a German composer, conductor and writer on music, regarded as the creator of the Singspiel, an early form of German opera. In many of these operas he collaborated with the poet Christian Felix Weiße.
Furthermore, Hiller was a teacher who encouraged musical education for women, his pupils including Elisabeth Mara and Corona Schröter. He was Kapellmeister of Abel Seyler's theatrical company, and became the first Kapellmeister of Leipzig Gewandhaus.
Read more at https://en.wikipedia.org/wiki/Johann_Adam_Hiller