Background: Victor August Herbert (February 1, 1859 - May 26, 1924) was an Irish-born, German-raised American composer, cellist and conductor. Although Herbert enjoyed important careers as a cello soloist and conductor, he is best known for composing many successful operettas that premiered on Broadway from the 1890s to World War I. He was also prominent among the tin pan alley composers and was later a founder of the American Society of Composers, Authors, and Publishers (ASCAP). A prolific composer, Herbert produced two operas, a cantata, 43 operettas, incidental music to 10 plays, 31 compositions for orchestra, nine band compositions, nine cello compositions, five violin compositions with piano or orchestra, 22 piano compositions and numerous songs, choral compositions and orchestrations of works by other composers, among other music.
Context: In 1894 Herbert composed his first operetta, Prince Ananias, for a popular troupe known as The Bostonians. The piece was well received, and Herbert soon composed three more operettas for Broadway, The Wizard of the Nile (1895), The Serenade (1897), which enjoyed international success, and The Fortune Teller (1898), starring Alice Nielsen. Although these achieved popularity, Herbert did not produce any more stage works for several years, focusing on his work with the Pittsburgh Symphony until 1904. Just before leaving that orchestra, he returned to Broadway with his first major hit, Babes in Toyland (1903). Two more successes followed, Mlle. Modiste (1905) and The Red Mill (1906), which solidified Herbert as one of the best-known American composers. He was elected to the National Institute of Arts and Letters in 1908. Although Herbert's reputation lies with his operettas, he also composed two grand operas. He searched for several years for a libretto that appealed to him, finally finding one by Joseph D. Redding called Natoma that concerned a historical story set in California. He composed the work from 1909 to 1910, and it premiered in Philadelphia on 25 February 1911 with soprano Mary Garden in the title role and the young Irish tenor John McCormack in his opera debut. The opera was well received and was repeated as part of the company's repertory during the next three seasons. It also enjoyed performances in New York City, making its debut there on February 28, 1911. Herbert's other opera, Madeleine, was a much lighter work in one act. On 24 January 1914, it had its premiere at the Metropolitan Opera, but it was not revived beyond that season. During this period, Herbert continued to compose operettas, producing two of his most successful works, Naughty Marietta (1910) and Sweethearts (1913). Another operetta, Eileen (1917, originally entitled Hearts of Erin), was the fulfillment of Herbert's desire to compose an Irish-themed operetta. The piece treats the Irish Rebellion of 1798 and boasts a rich score. This was the end of Herbert's greatest period of producing full scores for operettas. By World War I, with the birth of jazz, ragtime and new dance styles like the foxtrot and tango, Herbert reluctantly switched to writing musical comedies. These featured less elaborate ensembles and simpler songs for less classically trained singers than the European-style operettas that had dominated his earlier career. Herbert, during the last years of his career, was frequently asked to compose ballet music for the elaborate production numbers in Broadway revues and the shows of Irving Berlin and Jerome Kern, among others. He was also a contributor to the Ziegfeld Follies every year from 1917 to 1924.
Question: Was he sucessful?

Answer:
Just before leaving that orchestra, he returned to Broadway with his first major hit, Babes in Toyland (1903). Two more successes followed,