American universities graduate more women than men, and women comprise just under half the U.S. workforce. Yet women remain largely missing from the top echelons of corporate America. Fewer than 25 of Fortune 500 corporations are headed by women, and no Fortune 500 company in Georgia is headed by a woman CEO. The Atlanta Journal-Constitution brought together some of metro Atlanta’s top-ranking women to discuss this key issue in the wake of Facebook COO Sheryl Sandberg’s new book, “Lean In: Women, Work and the Will to Lead.” The book has provoked controversy, with competing views about the challenges women face. Panelists will share their perspectives over the next three weeks in print and online. Below, they talk about barriers in the workplace.