Few workforce topics have received as much attention during the past decade as the role of gender diversity, especially at the leadership level. Finally, we have seen the arrival of female CEOs in some of the top Fortune 500 companies. Corporations such as GM, HP, IBM, and PepsiCo now have female CEOs. What's more, females hold the top positions at Lockheed and General Dynamics, two traditionally male-dominated defense corporations.

Virginia Rometty, Chairman, President and CEO of IBM.

But for all the progress, we need to look at the big picture. Within five years, more women than men will be in the global workforce (we are already very close). And if females will be in the majority in the workforce, we could argue they should also be in the majority in leadership ranks. The reality? Female CEOs in the Fortune 500 represent a measly 4.8 percent. Outside the Fortune 500, the numbers are equally unimpressive. In 2010, female CEO positions across all types of corporations, small and large, stood at 14.4 percent; four years later, that number rose to a whopping 14.6 percent. In addition, the wage gap has not closed dramatically in 15 years. Women are paid less than males for just about every job.