Using data from the 1980-2010 time period, Francine Blau provides new empirical evidence on the extent of and trends in the gender wage gap, which declined considerably over this period.  By 2010, conventional human capital variables taken together explained little of the gender wage gap, while gender differences in occupations and industries continued to be important. Moreover, the gender pay gap declined much more slowly at the top of the wage distribution that at the middle or the bottom and, by 2010, was noticeably higher at the top. Francine also uses the literature to identify what has been learned about the explanations for the gap, considering the role of human capital and gender roles, gender differences in occupations and industries, gender differences in psychological attributes, and labor market discrimination against women. Francine Blau, Frances Perkins Professor of Industrial and Labor Relations and Professor of Economics, Department of Economics, ILR School, Cornell University