Johann Baptist Joseph Maximilian Reger, commonly known as Max Reger, was a German composer, pianist, organist, conductor, and academic teacher. He worked as a concert pianist, as a musical director at the Leipzig University Church, as a professor at the Royal Conservatory in Leipzig, and as a music director at the court of Duke Georg II of Saxe-Meiningen. Reger first composed mainly Lieder, chamber music, choral music and works for piano and organ. He later turned to orchestral compositions, such as the popular Variations and Fugue on a Theme by Mozart, and to works for choir and orchestra such as Gesang der Verklärten, Der 100. Psalm, Der Einsiedler and the Hebbel Requiem.

https://en.wikipedia.org/wiki/Max_Reger