In 2002 California guaranteed six weeks of paid leave for both mothers and fathers. New Jersey and Rhode Island have since anted up with 12 and 13 weeks, and other states are setting up similar policies. Many tech and Fortune 500 companies offer paid leave, and even Major League Baseball gives new dads paid time off. While the benefits to men and their newborn children are obvious, the long range benefits for the advancement of women in their careers and towards making workplaces more family friendly are only just now coming to light. Liza Mundi is a Bernard Schwartz Fellow at the New America Foundation and the author of The Richer Sex: How the New Majority of Female Breadwinners Is Transforming Sex, Love and Family.