Rami Nashashibi, who founded the Inner-City Muslim Action Network on Chicago's South Side 25 years ago, is a community builder, a teacher and a recipient of a MacArthur Foundation "Genius" award. Georgetown University has called him one of the world's 500 most-influential Muslims. What he is not is an imam. He is part of a rising generation of lay leaders blending ancient tradition with modern activism to mobilize their faith communities. Leaders such as Nashashibi are not replacing traditional institutions or houses of worship, but they bring an immediacy to their faith-based work that is re-energizing American religion.