It was established in 1900 on the death of Henry Sidgwick, who had supported Mind financially since 1891 and had suggested that after his death the society should be formed to oversee the journal.
Between 1952 and 1953 Aaron was invited to be Visiting Professor at Yale University, In 1956, where was able to study the third draft of Locke's An Essay Concerning Human Understanding at the Pierpont Morgan Library, which resulted in a substantial addition to the second edition of John Locke, published in 1955, a year where he was also made a Member of the British Academy and President of the Mind Association.
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He was a member of the American Philosophical Association, the Mind Association and the Humanities Association of Canada; he also served as President of the Canadian Philosophy Association in 1964 and as President of the Charles S. Peirce Society from 1957 to 1959.