This book—containing contributions from scholars who are well-known for their research on gangs, and selected as experts on the assigned topics—examines youth gangs from a developmental/life-course perspective, exploring a myriad of issues related to gang membership, its causes, its consequences, and various intervention efforts to both prevent gang membership and reduce the problematic impact of gangs. Beginning with research exploring the intergenerational continuity in gang membership and examining the causal processes leading to gang membership, the structure of the book reflects the developmental sequence of gang membership. The consequences of gang membership for youth are examined, as are intervention strategies. The book also presents the first conceptual framework on female gang involvement, taking into account the differences in the paths and roles that women and girls may take into the gang. The book concludes by exploring how gang membership affects job possibilities for young adults. This book was originally published as a special issue of the Journal of Crime and Justice.