Internationally, career prospects for postdocs, whether salaried on a Principal Investigator's (PI) grant or a fellowship, are precarious. Yet, many aspire to permanent research-teaching positions, and to achieve this goal they often strive to gain PI funding to demonstrate their research potential. Like many developers in research-intensive universities, we are responsible for supporting postdocs. Yet, it was unclear what actual support they needed. Further, studies show postdocs seldom access formal institutional support. Thus, we undertook a needs assessment. We describe here our substantive learning about supporting aspiring and new PIs, and then reflect more generally on the value of needs assessments in academic development practice.