Social Greek-letter organizations, more commonly known as fraternities (male-only) and sororities (female-only), are a longstanding tradition at colleges and universities in the United States. They claim to instill leadership skills in and offer a support network for members. However, in this article Wesley Routon and Jay Walker state that "going Greek" has both positive and negative effects during college and after graduation. On the positive side for example: (1) Greek members are more involved on campus and have higher post-graduation wages (males only) and more graduate-school attendance than non-affiliated students; (2) Greek-letter membership also correlates with increased retention and a shorter time to graduation, although it does not have a sizeable impact on GPA; (3) students who were more involved in high school often join Greek organizations; and (4) fraternity and sorority membership leads to greater campus involvement, even after controlling for student background. Some negative effects of membership include more drinking during college, more time spent partying, and more excessive drinking post-college (for males). Finally, after graduation, Greek membership in college is not associated with being employed at greater rates, but it is associated with higher income levels for males.