Dr. A.S.W. Rosenbach was a prominent American bibliophile and rare book dealer, known for his expertise in rare manuscripts and first editions. He played a significant role in the development of the rare book market in the early 20th century and was instrumental in establishing the Rosenbach Museum & Library in Philadelphia. Rosenbach was born in 1876 and became a key figure in the literary world, advising collectors and institutions on valuable works. His collection included notable items such as manuscripts by Charles Dickens and James Joyce, showcasing his deep appreciation for literature and history.