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them engaged in exciting work at the limits of understanding in their fields, sometimes with perspectives quite different from mine. More lively interchanges, in which Jeffrey was once again an active participant, often an effective gadfly. The impact of Jeffrey’s limitless curiosity, extensive knowledge, penetrating insights, and thoughtful appraisals is only heightened by his easy informality, without a trace of pretentiousness. He quickly became a highly valued friend and regular source of intellectual exchange and stimulation. Noam Chomsky Institute Professor (emeritus), MIT; Laureate Professor, U. of Arizona HOUSE_OVERSIGHT_022406