This book addresses gaps in the literature on father involvement in the lives of young children, a topic with a fast-rising profile in today's world of female breadwinners and single-parent households. While the significant body of theoretical understanding and empirical data accumulated in recent decades has done much to characterize the fluidity of evolving notions of fatherhood, the impact of this understanding on policy and legal frameworks has been uneven at an international level. In a field where groups of fathers were until recently marginalized in research, this book adopts a refreshingly inclusive attitude, aiming to motivate researchers to capture the nuanced practices of fathers in minority groups such as those who are homeless, gay, imprisoned, raising a disabled child, or from ethnically distinct backgrounds, including Mexican- and African-American fathers.