At fifteen, Victor Rios found himself a human target--flat on his ass amid a hail of shotgun fire, desperate for money and a place on the street. Faced with the choice of escalating a drug turf war or eking out a living elsewhere, he turned to a teacher, who mentored him and helped him find a job at an auto shop. That job would alter the course of his whole life--putting him on the road to college and eventually a PhD. Now, Rios is a rising star, hailed for his work studying the lives of African American and Latino youth.

In Human Targets, Rios takes us to the streets of...