Scientists who perform a scientific/technical role and a managerial role concurrently are called hybrid managers. These dual roles require different skill sets. However, it is unclear how hybrid managers combine these dual roles to achieve managerial congruence, that is, the perceived fit with the managerial role. This thesis aims to understand hybrid managers’ proactive management of the micro-transitions required to perform these dual roles effectively. In doing so, it adopts self-determination theory and job crafting as the underpinning theoretical frameworks, exploring how need satisfaction or frustration may facilitate or hinder managerial job crafting during such transitions. In turn, it considers how approach and avoidance job crafting impact a hybrid manager’s managerial congruence. Finally, this research considers the role of perceived organizational support (POS) in moderating this process. This mixed-method study included a quantitative survey (n=408) and one-to-one, post-hoc, qualitative interviews (n=15). The satisfaction of autonomy and relatedness needs facilitates approach crafting, which then can be expected to positively impact managerial congruence. POS was found to moderate the mediation effect of approach crafting on the relationship between competence and managerial congruence, and relatedness and managerial congruence. POS did not moderate any of the mediation effects for avoidance crafting. The qualitative findings suggest that while job crafting during transition is an intrinsic proactive process, hybrid managers benefit from organizational support when it is well structured. Implications of these findings for organizations are discussed, including the recommendation that future hybrid managers should undergo a pre-transition incubation period to prepare them for the transition; and during the transition, hybrid managers need structured training with a clear feedback loop embedded in the programme. It is recommended that hybrid managers in transition should take time to understand the managerial role before making changes to it and should receive coaching through the transition itself.