What is a "disruptive agent of change" and is this a quality that companies often seek in prospective CEOs? Is this woman the current CEO of Yahoo? In addition to answering the above question, do some research and find out if this CEO is still with Yahoo or if she has moved on. "What makes the perfect chief executive? Take Marissa Mayer, the newly appointed chief of Yahoo. She is a Stanford graduate, age 37, and Google's 20th employee. Until her new gig, Ms. Mayer was one of Google's stars. She was a well-known face for Google, serving on the board of Wal-Mart Stores, attending White House state dinners and appearing as a regular member of Fortune's 40 under 40 of the hottest young business executives. In the ultimate sign of tech prominence, she has almost 200,000 Twitter followers. Why her? According to the tech blog All Things D, she was thought to be a decisive and "disruptive agent of change" pushed by Daniel S. Loeb, the manager of the hedge fund Third Point, which owns about 6 percent of Yahoo. (Third Point disclosed in a regulatory filing on Tuesday that it had purchased an additional 2.5 million Yahoo shares.) Ms. Mayer is also from Google's technology and product side, an area that Yahoo wants to focus on as it struggles to define itself either as an Internet company like Google or a media company, its main source of revenue