context: His memoir of Alkan in his book Les Pianistes célèbres is nonetheless one of the most valuable sources for Alkan's biography.
source: Marmontel achieved renown as an effective and imaginative teacher.
reference_original: Marmontel a gagné la réputation d'être un enseignant imaginatif et efficace.
reference_flipped: Marmontel a gagné la réputation d'être une enseignante imaginative et efficace.