The Hogg Foundation for Mental Health's mission is to transform how communities promote mental health in everyday life. Policy engagement has always been a strategic priority for the organization. In 2010, the foundation launched the Hogg Foundation for Mental Health Policy Academy and Policy Fellow Initiative with the goal of bolstering the mental health and substance use policy workforce to make long-term systems change. The initiative supports ten host organizations to employ and mentor a full-time, mental health policy fellow for two years. This retrospective report provides the clearest evidence to date that philanthropic investment in the capacity of nonprofits to engage in meaningful public policy work by funding fellowships can yield benefits even in an area as complex as mental health.