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I've been blogging about women in philosophy but have mostly been thinking about the "problem of people and parks."
Feminist Theory, Philosophy of Science, Environmental Philosophy
For background data (not in philosophy, but in science and engineering) on research on gender differences in aptitude, patterns and mechanisms of discrimination, trends, etc., I can only recommend again the definitive report of the National Academies' Committee on Maximizing the Potential of Women in Academic Science and Engineering from 2007:
Beyond Bias and Barriers: Fulfilling the Potential of Women in Academic Science and Engineering
as well as a new report (2009):
Gender Differences at Critical Transitions in the Careers of Science, Engineering, and Mathematics Faculty
It's instructive to compare philosophy to mathematics: roughly the same numbers, but in mathematics it has been improving (31% women math PhDs in 2008 vs 24% 10 years earlier) while in philosophy the numbers have remained around 28% for a while.
I would only add that the U.S. Department of Education statistics suggest that the gender disparity, at least in the US, does begin at the undergraduate level. Women have only been earning about 30% of bachelor's degrees in philosophy, though they earn more than half of bachelor's degrees overall in all subjects. That difference between women and men is maintained and only slightly widened for master's and doctorate degrees. The gap widens again, and more significantly, at the stages of hiring and tenure.Helen Beebee, a University of Birmingham lecturer and director of the British Philosophical Association (BPA), says her impression is that there are roughly equal numbers of men and women graduating with good bachelor degrees in philosophy and that the numbers of women start to drop off at MA level and then again at PhD level.
Jennifer Saul, a Sheffield University lecturer...says that relative to post-graduate students, there is a significant drop in the number of women going on to become temporary lecturers. She says that number decreases again at permanent and more senior levels of academic philosophy and agrees that an aggressive culture may be a contributing factor. “I think that very combative ‘out to destroy the speaker’ sort of philosophy is something that a lot of women find uncomfortable,” she says. “But I wouldn’t want to say it’s just a problem for women – I think it’s a problem for men and a problem for philosophy because I don’t think it’s a good way to do philosophy.”
Beebee says people might see the fact that so few women choose to pursue a career in philosophy as unproblematic if there is no overt sexism going on but argues that “sustaining a culture whose effect is to exclude women is arguably a form of discrimination, even if the discrimination is neither conscious nor based on unconscious assumptions. And if women who would have made really good philosophers are not entering the profession, the philosophy that’s being done overall is not as good as it would have been if they had.”