Karl Eduard Goepfart (8 March 1859 — 30 January 1942)
＝ Alternative Names/Transliterations: Karl Eduard Gôpfart, Karl Goeppard
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Just careful the (first edition one assumes) score you're using as your source does not say "C.A. Goepfert" or similar; Carl Andreas Goepfert (1768-1818) was a clarinettist-composer of the Classical period, Goepfert is not necessarily just a typo and may be a warning the work may not be by Goepfart...