A.S.W. Rosenbach was a prominent American bookseller and bibliophile, known for his expertise in rare books and manuscripts. Born in 1876, he played a significant role in the development of the rare book market in the United States. His shop, Rosenbach Company, became a hub for collectors and scholars, showcasing valuable literary works. Rosenbach was also a key figure in the establishment of the Rosenbach Museum & Library in Philadelphia, which houses his extensive collection of rare books, manuscripts, and art. His contributions to the field of bibliophily have left a lasting impact on the appreciation of literary heritage.