No. 13: Kabam, Holly Liu

Name: Holly Liu

Job title: Cofounder and chief of staff, Kabam

Why she's powerful: Kabam makes some extremely popular free video games like "Kabam's Kingdoms of Camelot" franchise which has grossed more than $250 million in four years, the company says.

Kabam recently extended its partnership with Warner Bros. Interactive Entertainment to make games based on "The Lord of the Rings" movies and the upcoming "Mad Max" film, too.

As cofounder Liu leads the HR team for more than 800 employees worldwide. Before focusing on hiring, she led the product design for the "Kingdom’s of Camelot" games.

Prior to Kabam, Liu was senior user interface designer for AOL, where she led the design of community web products.