Kim Green

In a cave-like basement bursting with rickety old bicycles, tires and churning middle-schoolers, Daniel Furbish barks orders.

Close-cropped beard, pen behind his ear, Furbish is an artist-turned-teacher from a military family — creative and disciplined. He started his Nashville, Tenn., bike-building workshop as a summer experiment. He thought, "What if I take donated bike parts and teach kids to put them together?"