Someone in the household must take time away from work to care for children or aging parents. That duty requires work flexibility and a non-linear career path, and most often falls to the woman. As the founding president of the Center for Work-Life Policy, Sylvia Ann Hewlett has been researching the transitions into and out of careers, and, as a result, has written Off-Ramps and On-Ramps: Keeping Talented Women on the Road to Success. Erik talked with her about it, and she became our latest Cool Friend. Read the interview (and the book) to find out what some very large companies are doing to make it easier for you to work and live.