The gender earnings gap is an expanding statistic over the lifecycle. We use the LEHD Census 2000 to understand the roles of industry, occupation, and establishment 14 years after leaving school. The gap for college graduates 26 to 39 years old expands by 34 log points, most occurring in the first 7 years. About 44 percent is due to disproportionate shifts by men into higher-earning positions, industries, and firms and about 56 percent to differential advances by gender within firms. Widening is greater for married individuals and for those in certain sectors. Non-college graduates experience less widening but with similar patterns.