Tell your earnest young pediatrician that your son's teacher is Mary Catherine Bradshaw, and he gets a dreamy look of remembrance. This is hardly rare. Doctors, lawyers, bankers, social workers, professors, journalists and entrepreneurs will attest that it was Bradshaw who alternately nurtured and pushed them through their anxious teen years, instilling an appreciation for learning, a tempered rebellion against blind conformity and the confidence to be who they are. A Nashville native and Harpeth Hall grad who seems to know every blueblood in town, Bradshaw has dedicated her 25-year career to giving public school students the same quality education as their private school peers. Thanks to her efforts, Hillsboro became an International Baccalaureate-authorized school in 2004. The blond-ponytailed dynamo in Oxford shirts and khakis has impeccable manners, genuine warmth and social grace. But anyone foolish enough to threaten the programs that enrich her students will find out just what kind of war a steel magnolia can wage. KAY WEST