Deb Liu is CEO of Ancestry, the $5 billion genealogy platform, and the author of Take Back Your Power: 10 New Rules for Women at Work. While overt discrimination against women may have receded in recent years, she says covert discrimination, including unconscious bias, can be just as pernicious, keeping women from reaching the peaks of success. She pushes for women to find themselves not just mentors offering advice, but a sponsor who will put­ their own career on the line to advance that of someone they believe in.