We explore the malleability of human capital resources in organizations. Our 55 interviews across four studies of contemporary professionals lead us to posit that instead of being fixed, human capital resources are continuously created in their engagement. We describe how such resource engagement occurs. We identify its enabling factors as activities, the self, others, managers, work contexts, and show that the engagement experience itself fluctuates between edging, the peak experience, and retreating, the need to wind down. We contribute to theorizing on strategic human resource management by proposing how human capital is created, and how this leads to its malleability as an organizational resource. We also contribute to resourcing theory by exploring how individuals variously engage their own agency for resource creation.