Climbing to the top of the professional ladder is hard enough for any worker, but when that worker is a woman, the challenges increase exponentially. According to an article published by Women on Business, "As of 2010, only 2.4 percent of the U.S. Fortune 500 chief executives were female [and] only 6 percent of U.S. companies have a woman CEO." As a result, we're always impressed when we read about a woman who has ascended to a principal position at a large firm. We want to hear her story, learn from her experiences, and be inspired in our own career pursuits. Here are five tips from powerful businesswomen who overcame the odds and broke through the glass ceiling.