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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.
The copy used for the edition published by the Early English Text Society is from the Pierpont Morgan Library—it was previously owned by the Earl of Aylesford and Lord Amherst of Hackney.