This article presents a measurement instrument (TERDS) to measure teacher educators’ self-reported researcherly disposition throughout their working lives. The first part of the article reports the results of factor analysis (EFA and CFA), which suggest a four-factor structure of teacher educators’ researcherly disposition: (1) ‘ valuing research’, (2) ‘being a smart consumer of research’, (3) ‘ being able to conduct research’, and (4) ‘conducting research’. Goodness of fit estimates were calculated, indicating good fit. The authors conclude that by using the instrument to explore differences between several subgroups of teacher educators, this study enhances empirical understanding of a previously ‘undiscovered’ and ‘neglected’ professional group.