Why are women socially excluded in fields dominated by men? Beyond the barriers associated with any minority group's mere numerical underrepresentation, we theorized that gender stereotypes exacerbate the social exclusion of women in science, technology, engineering, and math (STEM) workplaces, with career consequences. Although widely discussed, clear evidence of these relationships remains elusive. In a sample of 1,247 STEM professionals who work in teams, we tested preregistered hypotheses that acts of gendered social exclusion are systematically associated with both men's gender stereotypes (Part 1) and negative workplace outcomes for women (Part 2). Combining social network metrics of inclusion and reaction time measures of implicit stereotypes (the tendency to "think STEM, think men"), this study provides unique empirical evidence of the chilly climate women often report experiencing in STEM. Men with stronger implicit gender stereotypes had fewer social ties to female teammates. In turn, women (but not men) with fewer incoming cross-gender social ties reported worse career fit and engagement. Moderated mediation revealed that for women (but not men), cross-gender social exclusion was linked to more negative workplace outcomes via lower social fit. Effects of social exclusion were distinct from respect. We discuss the possible benefits of fostering positive cross-gender social relationships to promote women's professional success in STEM.
Keywords: STEM; gender; implicit bias; social networks; stereotyping.