The Power Player today is Herbalife chief executive officer Michael Johnson. Johnson is launching an all out defense of the nutritional supplements company, telling key investors at at an event Thursday his company is "legitimate." Herbalife's business model is at the center of a battle between two hedge fund titans. One, Daniel Loeb, is betting Herbalife will flourish. Loeb gave Herbalife a shot in the arm by buying a stake of more than 8 percent.