Her work inspires change by combating gender inequities in math achievement. Women are vastly under-represented in STEM fields and Mary’s research reveals that this problem begins at a very early age. Despite no differences in math performance between males and females, girls feel more anxious about math and have lower confidence in their math abilities compared to boys. Mary critically examines factors contributing to the math gender imbalance, such as a lack of female role models, math anxiety, implicit bias, stereotype threat, and work-family issues.