For research to positively impact society, it must be scientifically credible. The researcher plays a key role in establishing and maintaining credibility, particularly in the climate change field. This paper provides a structure for relating the credibility of researchers themselves to that of research outputs, analysing 'researcher credibility' with reference to three overlapping domains: personal, professional, and public. The researcher's role in each domain is considered in a reflexive way, examining the research process and the researcher's actions. Varied definitions of researcher credibility and possible means to achieve it in each domain are discussed, drawing on relevant cross-disciplinary literature. We argue that, in certain contexts, the actions of researchers can have a direct impact on the credibility of their research. There is scope for broadening researcher credibility to include more public-oriented behaviours. This, however, may be contentious and problematic: there are potential conflicts between public action and professional credibility, with the latter usually taking precedence. By contrast, though personal action (or inaction) rarely affects professional credibility, researchers' personal behaviours may influence public perceptions of research credibility and the importance of addressing climate change.

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