He became interested in both poetry and visual art, and started to attend evening classes at Birkbeck College. He withdrew from his apprenticeship in January 1911, as he had managed to find the finances to attend the Slade School of Fine Art at University College, London (UCL). During his time at Slade School, Rosenberg notably studied alongside David Bomberg, Mark Gertler, Stanley Spencer, Paul Nash, Edward Wadsworth, Dora Carrington, William Roberts, and Christopher Nevinson. He was taken up by Laurence Binyon and Edward Marsh, and began to write poetry seriously, but he suffered from ill-health. He published a pamphlet of ten poems, "Night and Day", in 1912. He also exhibited paintings at the Whitechapel Gallery in 1914.