In recent years religious leaders of mainline Christian and Jewish groups have been calling on their adherents to play a larger role in the creation of a just social order. One of the most publicized of these was the declaration of the American Catholic bishops, Economic Justice For All. It remains to be seen whether believers raised in an era of affluence are deeply committed to the plight of the needy, and whether religion itself can mark out a path between social activism and conventional party politics. John Courtney Murray (1904-1967) was a pioneer in the ongoing dialogue about the role of believers in public life. For all of his contributions, however, Murray spoke in a patrician manner to a social order that was stable and structured. How useful are his ideas in an age of multiculturalism, when the strongest pressure for justice comes from grassroots organizations of the poor and marginalized?The Believer as Citizen proposes a fresh view of Murray's public philosophy in a way that makes it applicable to today's conditions.