The purpose of this article was to review literature on teacher psychological capital (PsyCap) and leadership responsibility for developing staff. A related purpose involved investigating the phenomenon of second-career teachers (SCTs) with direct relevance for school administration. The research question guiding this analysis was, What does the research convey about teacher PsyCap in relation to the role of leaders and career switchers in particular? Peer-reviewed research from 2012 to 2023 and in international contexts was analyzed, totaling 89 articles and 5 books. In light of the teacher attrition crisis worsened by the so-called Great Resignation during the pandemic, career switcher numbers rose. Building leaders' support for maintaining a healthy environment and retaining a quality workforce can be bolstered with knowledge of teacher PsyCap and its relationship to satisfaction and happiness. Advancing education as a focus of study in positive psychology, the authors studied teachers' and leaders' conceptions of PsyCap, satisfaction, and happiness from a solution-generating approach. The role of leadership in investing in teacher psychology relative to hope, efficacy, resilience, and optimism (HERO) is highlighted. Leaders' awareness of these qualities and how to foster them in order to both influence and manage positive attitudes and behaviors at work warrant deliberation on behalf of all staff, including SCTs. This topic in research and within schools deserves more attention.