Beach is a historian of Indian art, specifically Indian painting.[1][2] He graduated from Harvard College and credits the music of Ravi Shankar for garnering his interest in Indian culture. Before earning his Ph.D. at Harvard, he was already a curator at the Fogg Art Museum and Boston Museum of Fine Arts.[3] He is an authority on Mughal painting of the Akbar to Shah Jahan periods and has published important catalogues on the subject including The Grand Mogul: Imperial Painting in India 1600-1660 (Williamstown, 1978), now a classic in its field.[1]
In 1993, Beach published his research on the British Royal Collection's 17th-century manuscript of the Padshahnama. The Royal Librarian described the publication as the "best catalogue ever produced for an exhibition from Windsor Castle."[3] In October, 2001, Beach retired as the director of both the Sackler and the Freer Gallery of Art. Beach returned to research, specifically focusing on the work of the Mughal Empire.[3]