I have a test where I am given the following article, what is an answer for the question: What was the full name of the composition teach John Grainger said he was "my only composition teacher"? ?

In Frankfurt, Rose established herself as a teacher of English; her earnings were supplemented by contributions from John Grainger, who had settled in Perth. The Hoch Conservatory's reputation for piano teaching had been enhanced by the tenure, until 1892, of Clara Schumann as head of piano studies. Grainger's piano tutor was James Kwast, who developed his young pupil's skills to the extent that, within a year, Grainger was being lauded as a prodigy. Grainger had difficult relations with his original composition teacher, Iwan Knorr; he withdrew from Knorr's classes to study composition privately with Karl Klimsch, an amateur composer and folk-music enthusiast, whom he would later honour as "my only composition teacher".Together with a group of slightly older British students – Roger Quilter, Balfour Gardiner, Cyril Scott and Norman O'Neill, all of whom became his friends – Grainger helped form the Frankfurt Group. Their long-term objective was to rescue British and Scandinavian music from what they considered the negative influences of central European music. Encouraged by Klimsch, Grainger turned away from composing classical pastiches reminiscent of Handel, Haydn and Mozart, and  developed a personal compositional style, the originality and maturity of which quickly impressed and astonished his friends.  At this time Grainger discovered the poetry of Rudyard Kipling and began setting it to music; according to Scott, "No poet and composer have been so suitably wedded since Heine and Schumann."After accompanying her son on an extended European tour in the summer of 1900, Rose, whose health had been poor for some time, suffered a nervous collapse and could no longer work. To replace lost income, Grainger began giving piano lessons and public performances; his first solo recital was in Frankfurt on 6 December 1900. Meanwhile he continued his studies with Kwast, and increased his repertoire until he was confident he could support himself and his mother as a concert pianist. Having chosen London as his future...

Karl Klimsch