Franz Xaver Richter

Franz (Czech: František) Xaver Richter, known as François Xavier Richter in France was an Austro-Moravian singer, violinist, composer, conductor and music theoretician who spent most of his life first in Austria and later in Mannheim and in Strasbourg, where he was music director of the cathedral. From 1783 on, Haydn's favourite pupil, Ignaz Pleyel, was his deputy director.

The most traditional of the first-generation composers of the so-called Mannheim school, he was highly regarded in his day as a contrapuntist. As a composer he was equally at home in the concerto and the "strict church style". Mozart heard a mass by Richter on his journey back from Paris to Salzburg in 1778 and called it "charmingly written".

Read more at https://en.wikipedia.org/wiki/Franz_Xaver_Richter