Many prominent and successful women cite Nancy Drew as an early formative influence whose character encouraged them to take on unconventional roles, including U.S. Supreme Court Justices Sandra Day O'Connor, Ruth Bader Ginsburg, and Sonia Sotomayor; TV personalities Oprah Winfrey and Barbara Walters; singers Barbra Streisand and Beverly Sills; mystery authors Sara Paretsky and Nancy Pickard; scholar Carolyn Heilbrun; actresses Ellen Barkin and Emma Roberts; former Secretary of State Hillary Rodham Clinton; former First Lady Laura Bush; and former president of the National Organization for Women Karen DeCrow. Less prominent women also credit the character of Nancy Drew with helping them to become stronger women; when the first Nancy Drew conference was held, at the University of Iowa, in 1993, conference organizers received a flood of calls from women who "all had stories to tell about how instrumental Nancy had been in their lives, and about how she had inspired, comforted, entertained them through their childhoods, and, for a surprising number of women, well into adulthood."