This chapter focuses on helping employees thrive through leader development and leveraging positive psychological states by providing an understanding of what thriving means and steps to help others achieve the state of thriving. If you are a leader or lead others, the chapter shares valuable tips for encouraging positive outcomes through thriving. It explains how thriving individuals are most likely to engage in and benefit from leader development. Although organizations often offer leader development opportunities, much of leader development is self-led. The chapter looks broadly at the precursors to thriving as it applies to leaders and their propensity to engage in leader development. Then, it is suggested that engagement in leader development can improve mental health outcomes that facilitate future thriving. Finally, we provide suggestions for how to measure thriving in organizations.