 Reiter says he was a contributor to the third IPCC Working Group II (Impacts, adaptation and vulnerability) report, but resigned because he "found [himself] at loggerheads with persons who insisted on making authoritative pronouncements, although they had little or no knowledge of [his] speciality".After ceasing to contribute he says he struggled to get his name removed from the Third report 

Reiter is sceptical about the IPCC process, as seen in his April 25, 2006, testimony to the United States Senate