Women scientists are much more likely than men scientists to be in two-career marriages. This study examines the argument that the higher prevalence of two-career marriages among women scientists presents a significant impediment to their geographic mobility. Three hypotheses are developed and tested. First, scientists in two-career families are less likely to migrate than scientists in one-career families. Second, the effect of two-career marriages on the probability of migration differs with gender; women are affected more negatively. Third, the effect of children on the probability of migration differs with gender; women are affected more negatively. The empirical work uses a data set of doctoral scientists extracted from the 5% Public Use Microdata Sample from the 1990 census. The first two hypotheses are not confirmed by the empirical results, but we find evidence supporting the third. Family constraints on women scientists'careers generally appear to be weak, but become acute when they have children.
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