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Claude Bissell was the president of the University of Toronto.

Milton Rokeach was a professor of social psychology at Michigan State University.

Michael Swann was principal and vice-chancellor of the University of Edinburgh, where he was also a professor of natural history. Swann was a biologist and zoologist whose research addressed cell division and fertilization. At the time of his talk, he was advising the British government on science policy. In 1969, he led the Swann Report on The Flow into Employment of Scientists, Engineers and Technologists, issued by the Swann Working Group on Manpower for Scientific Growth of the Committee on Manpower Resources for Science and Technology.

Herbert Butterfield was elected Chair in Modern History at Cambridge University in 1944 after 20 years as a fellow at Peterhouse College.. He taught modern history, especially the eighteenth and nineteenth centuries, and authored a number of books, including two on Napoleon.

Cecil Day Lewis was professor of poetry at the University of Oxford, a position he held from 1951 to 1956. He authored several studies of poetry as well as two books of poems including Country Comets (1928) and Overtures to Death (1938). He also wrote detective stories under the pen name Nicholas Blake.

Frank H. Underhill was a writer and radio commentator, as well as a professor of history at the University of Toronto. He was a noted Canadian social democrat and public intellectual. Underhill was the first individual to be the Dunning Trust lecturer twice, once in 1954-55 and once in 1966-67. Underhill studied at the University of Toronto and Oxford University, after which he taught at the University of Saskatchewan during the 1920s “progressive” era. During the First World War, he served as an officer in the British Army.