Answer
The answer is Gustave Charpentier. Unlike his contemporaries and fellow French composers Claude Debussy and Gabriel Pierné, Charpentier never studied under Jules Massenet at the Paris Conservatoire. He instead enrolled at the École Niedermeyer de Musique, a private music school in Paris. Charpentier's musical style was influenced by his admiration for Richard Wagner and his operas often exhibited a blend of naturalism and symbolism.