Although reflective teaching and well-being have been promoted as a means to promote teaching quality, there is little empirical evidence to illustrate their impact on enhancing professional development. To fill this existing gap, this study adopts a mixed-methods approach to examine the contribution of reflection and psychological well-being as predictors of professional development. In so doing, 350 English language teachers participated in a survey and follow-up interviews. The correlational analysis confirmed the positive relationship among these three constructs, and a structural equation modelling indicated that both reflection and well-being significantly predicted professional development; however, well-being was a stronger predictor compared to reflection. The qualitative analysis of data revealed four main themes contributing to professional development among teachers. The pedagogical implications are also elaborated and discussed.
