Will women “leaning in” break the glass ceiling?

Debate over the existence of a “glass ceiling” for women for top leadership positions has been renewed by the publication of the book, Lean In: Women, Work and the Will to Lead, by Sheryl Sandberg, COO of Facebook, and some new research data on gender equity. Sandberg is ranked on Fortune’s list of the 50 Most Powerful Women in Business and one of Time Magazine’s 100 Most Influential People in the World.