That's one of the interesting things. Statistically HR has a similar gender ratio as engineering, only reversed -- 72% of all HR professionals are women (http://www.bls.gov/cps/cpsaat11.pdf).
Simply mentioning PR and P Quadtrees tipped me off since that class is the only time I've ever heard of those data structures mentioned. Then I checked out your website and saw you went to UMD. Case closed, haha.