Saywell was the editor of two journals:
Canadian Historical Review, from 1957 to 1963; and
Canadian Annual Review from 1960 to 1979. Among his books were
The Office of Lieutenant-Governor: A Study in Canadian Government and Politics, which won the Delancey K. Jay Prize at Harvard University.
Just Call Me Mitch: The Life of Mitchell F. Hepburn, published in 1991, won the Floyd Chalmers Award for the best book on
Ontario history. His 2002 study of the
Supreme Court of Canada, titled
The Lawmakers: Judicial Power and the Shaping of Canadian Federalism, won the John W. Dafoe Prize for "distinguished writing on Canada and/or Canada’s place in the world." He also interpreted Canadian, British and European history for thousands of high-school students across Ontario through close to a dozen textbooks with his friend John Ricker. == Legacy ==