Recent policies encourage the development of programs designed to improve the economic status of low-income nonresident fathers and the financial and emotional support provided to their children. This brief provides ten key lessons from several important early responsible fatherhood initiatives that were developed and implemented during the 1990s and early 2000s. Formal evaluations of these earlier fatherhood efforts have been completed making this an opportune time to step back and assess what has been learned and how to build on the early programs' successes and challenges.