an abolitionist printer, publisher, and bookseller in Boston, Massachusetts. He is remembered primarily for his collaboration with William Lloyd Garrison in printing and publishing The Liberator newspaper. He also co-founded the New England Anti-Slavery Society. His printing office was located on Congress Street (circa 1831) and then on Cornhill. In 1837, the address of the Boston office of the American Anti-Slavery Society was Knapp's address. In later years of the 1830s he ceased printing books, used other printers, and turned his printing office into a bookstore.
