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De Ropp was still working at Lederle Laboratories, in the state of New York, when he wrote Man Against Aging (1960). Writing in New Scientist in 1961, A T Welford described the aim of the book as ‘to bring to the general reader the results of the considerable body of experimental biological research which has been done on ageing since the beginning of the century, and especially during the last thirty years’. However, while he thought the result ‘concise and readable’, he criticised it for ‘loose thinking’.