Michael Mann and colleagues intimate that I had an undeclared conflict of interest in reviewing Roger Pielke Jr's book The Climate Fix (Nature 467,920; 2010), citing alleged connections between me and the George C. Marshall Institute in Arlington, Virginia, reputedly a centre of climate-change scepticism. Contrary to the authors' assertions, I did not write a report for the Marshall Institute. My relationship with the institute consists solely of participation in a 90-minute discussion in 2006 concerning how Congress deals with scientific issues (see go.nature.com/epxftl). Also taking part were a former member of the congressional Office of Technology Assessment and a current senior official of the US National Research Council of the National Academy of Sciences.
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