Please answer the following question: What is the name of the person that believes Longacre's use of such symbols influenced later coin designers, such as George T. Morgan  Answer the above question based on the context below:  James Longacre died suddenly at his home in Philadelphia on January 1, 1869.  A memorial meeting was held at the Philadelphia Mint on January 5, attended by the facility's employees. The Director of the Mint, Henry Linderman, delivered a speech in praise of Longacre prior to the formal eulogy, which was given by Longacre's assistant, William Barber, who would be appointed as Longacre's successor.  Like each of his predecessors, Longacre died in office.Longacre was recognized in an exhibit of 100 notable American engravers sponsored by the New York Public Library in 1928.  In 1970, art historian Cornelius Vermeule, in his volume on U.S. coins, viewed Longacre and his works less favorably, "uniform in their dullness, lack of inspiration, and even quaintness, Longacre's contributions to patterns and regular coinage were a decided step backwards from the art of [Thomas] Sully, [Titian] Peale, [Robert] Hughes, and Gobrecht" and "whatever his previous qualities as an engraver of portraits, he seems not to have brought much imagination to his important post at the Philadelphia Mint."  However, Vermeule considered the Flying Eagle cent more of a work of art, far above the mundane.In his 1991 article, McKenzie notes Vermeule's concerns, but considers Longacre's work important for its use of American symbols, including the representations of Native Americans.  He believes Longacre's use of such symbols influenced later coin designers, such as George T. Morgan, Victor D. Brenner, and Augustus Saint-Gaudens.  He particularly praises the ornate scroll on the reverse of the double eagle, calling it "unique in American numismatic art and enhances the elegance of a design befitting the highest-denomination U.S. coin", and applauds "the exciting innovation in symbolism and expression of national sentiment that he brought to U.S. numismatic art".According to Bowers, "Today, Longacre is widely admired by numismatists."  Lange notes that Longacre's "artistic vision graced 60 years of American coins".  Snow writes, In view of the...
A:
McKenzie