In the years after the Civil Rights Act of 1964, women in the workplace still found themselves relegated to secretarial positions or locked out of jobs entirely. This was especially true in the news business, a backwater of male chauvinism where a woman might be lucky to get a foothold on the "women's pages." But when a pioneering nonprofit called National Public Radio came along in the 1970s, and the door to serious journalism opened a crack, four...