For a time Harrison was closely associated with Brian Aldiss. They collaborated on a series of anthology projects and did much in the 1970s to raise the standards of criticism in the field, including institution of the John W. Campbell Memorial Award for Best Science Fiction Novel. Priest wrote, "In 1965 Harrison and Aldiss published the first issue (of two) of the world's first serious journal of SF criticism, "SF Horizons". Together they edited many anthologies of short stories, each one illustrating the major themes of SF, and although not intended as critical apparatus the books were a way of delineating the unique material of the fantastic. As committed internationalists, the two men created World SF, an organisation of professionals intended to encourage and enhance the writing of non-anglophone SF." In particular, the two edited nine volumes of "The Year's Best Science Fiction" anthology series as well as three volumes of the "Decade" series, collecting science fiction of the 1940s, 1950s and 1960s respectively.