Giacomo Meyerbeer
Giacomo Meyerbeer (born Jacob Liebmann Beer; 5 September 1791 – 2 May 1864) was a German opera composer of Jewish birth, "the most frequently performed opera composer during the nineteenth century, linking Mozart and Wagner". With his 1831 opera "Robert le diable" and its successors, he gave the genre of grand opera 'decisive character'. Meyerbeer's grand opera style was achieved by his merging of German orchestra style with Italian vocal tradition. These were employed in the context of sensational and melodramatic libretti created by Eugène Scribe and were enhanced by the up-to-date theatre technology of the Paris Opéra. They set a standard which helped to maintain Paris as the opera capital of the nineteenth century.
Giacomo Meyerbeer
Born to a very wealthy Berlin family, Meyerbeer began his musical career as a pianist but soon decided to devote himself to opera, spending several years in Italy studying and composing. His 1824 opera "Il crociato in Egitto" was the first to bring him Europe-wide reputation, but it was "Robert le diable" (1831) which raised his status to great celebrity. His public career, lasting from then until his death, during which he remained a dominating figure in the world of opera, was summarized by his contemporary Hector Berlioz, who claimed that he 'has not only the luck to be talented, but the talent to be lucky.' He was at his peak with his operas "Les Huguenots" (1836) and "Le prophète" (1849); his last opera ("L'Africaine") was performed posthumously. His operas made him the most frequently performed composer at the world's leading opera houses in the nineteenth century.
French opera
French opera is one of Europe's most important operatic traditions, containing works by composers of the stature of Rameau, Berlioz, Gounod, Bizet, Massenet, Debussy, Ravel, Poulenc and Messiaen. Many foreign-born composers have played a part in the French tradition as well, including Lully, Gluck, Salieri, Cherubini, Spontini, Meyerbeer, Rossini, Donizetti, Verdi and Offenbach.
French opera
French opera began at the court of Louis XIV of France with Jean-Baptiste Lully's "Cadmus et Hermione" (1673), although there had been various experiments with the form before that, most notably "Pomone" by Robert Cambert. Lully and his librettist Quinault created "tragédie en musique", a form in which dance music and choral writing were particularly prominent. Lully's most important successor was Rameau. After Rameau's death, the German Gluck was persuaded to produce six operas for the Parisian stage in the 1770s. They show the influence of Rameau, but simplified and with greater focus on the drama. At the same time, by the middle of the 18th century another genre was gaining popularity in France: "opéra comique", in which arias alternated with spoken dialogue. By the 1820s, Gluckian influence in France had given way to a taste for the operas of Rossini. Rossini's "Guillaume Tell" helped found the new genre of Grand opera, a form whose most famous exponent was Giacomo Meyerbeer. Lighter "opéra comique" also enjoyed tremendous success in the hands of Boïeldieu, Auber, Hérold and Adam. In this climate, the operas of the French-born composer Hector Berlioz struggled to gain a hearing. Berlioz's epic masterpiece "Les Troyens", the culmination of the Gluckian tradition, was not given a full performance for almost a hundred years after it was written.

Question: Who worked as a composer in the French opera, but was born in Germany?
Answer: Giacomo Meyerbeer