This article begins the work of examining what kind of doctoral experiences positively influence researcher development, and what other attributes may contribute to a successful research career. It reports preliminary findings from the analysis of survey responses by a sample of successful mid-career researchers. Positive doctoral experiences and the early establishment of research activity are found to be important to researcher development. Successful researchers were also found to be able to acknowledge the importance of their 'soft skills', and to have flexible, responsive and adaptive dispositions. We term this disposition 'an entrepreneurial subjectivity' and argue that it is an important and underexamined characteristic of the successful researcher.Successful mid-career researchers are an ideal cohort to begin the work of identifying what in the doctoral experience contributes to the development of a successful researcher and the qualities and attributes of successful researchers. To this end, we surveyed recipients of Australian 'Future Fellowships', competitive four-year research grants awarded to those with between 5 and 15 years post-doctoral experience. Future Fellowships are awarded by the Australian Research Council (ARC), the premier national research funding organisation.The survey was designed to investigate how successful researchers are developed with a particular focus on the role and influence of the doctorate in this process. Preliminary findings from an analysis of survey responses are outlined in this article. After introducing the study and outlining characteristics of the cohort, findings are discussed thematically concerning motivations for research, the doctoral experience, publication and preparation for a research role, and to what factors participants in the survey attribute their research success.The findings point overwhelmingly to a positive doctoral experience and early establishment of research efficacy as important to researcher development; and to successful researchers having a repertoire of 'soft skills', including a reflective capacity to recognise the importance of soft skills to their success as researchers. In addition, a key finding of this study is that successful researchers appear to have flexible, responsive and adaptive dispositions; what we call 'an entrepreneurial subjectivity'. We argue that an 'entrepreneurial subjectivity' is an important and under-examined characteristic that may be the making of, as well as what is required of, successful researchers.