Carmel Snow, who changed the course of our culture by launching the careers of some of today's greatest figures in fashion and the arts, was one of the most extraordinary women of the twentieth century. As editor in chief of Harper's Bazaar from 1934 to 1958 she championed the concept of "a well-dressed magazine for the well-dressed mind," bringing cutting-edge art, fiction, photography, and reportage into the American home. Now comes A Dash of Daring, a first and definitive biography of this larger-than-life figure in publishing, art, and letters. Veteran magazine journalist Penelope...