This paper describes the gender distribution of research fields in economics by means of a new dataset about researchers working in the world top-50 Economics departments, according to the rankings of the Econphd.net website. We document that women are unevenly distributed across fields and test some behavioral implications from theories underlying such disparities. Our main findings are that the probability that a woman works in a given field is positively related to the share of women in that field (path-dependence), and that the share of women in a field decreases with their average quality. These patterns, however, are weaker for younger female researchers. Further, we document how gender segregation of fields has evolved over different Ph.D. cohorts.