This study had several goals to: (a) describe the associations between aspects of personal and social identity, generativity, and the development of teacher identity in first year teaching students; and (b) examine which aspects of personal and social identity, and generativity predict teacher identity after controlling for a number of relevant covariates. A further aim of the study was to discuss the theoretical and research implications of considering professional teacher identity from a developmental and social psychological perspective in light of the results from the present analysis. This study suggests that those who have a well-formed sense of personal identity are more likely to be ready to begin the process of forming a professional identity. The findings also point to the potential value of pursuing an understanding of professional teacher identity as a developmental and social psychological process.