Marissa Mayer made her first major hire today since joining Yahoo as its CEO. This afternoon, the media company announced that Kathy Savitt will come on board as chief marketing officer on Sept. 14. She’ll report to Mayer.

Savitt has a rare combination of operations and entrepreneurial experience. For almost four years, she was the chief executive of Lockerz, a social-commerce company focused on teenagers which grew to 45 million users. Investors have proven willing to place their faith in Savitt — she succeeded in raising about $75 million in venture capital for Lockerz. Savitt is not abandoning the company; she will remain as Lockerz’s chairman of the board and will make a large financial investment. Mark Stabingas will assume the role of chief executive.

Prior to founding Lockerz, she was the CMO of clothing retailer American Eagle and a VP of strategic communications at Amazon. In the release, Mayer credited the new hire for her extensive experience in “building and refining well-loved consumer brands.” At Yahoo, Savitt will be responsible for worldwide marketing and branding.

“I believe passionately in Yahoo’s ability to inspire and delight users, partners, and advertisers around the world and am excited to join Marissa in defining Yahoo’s next chapter,” Savitt said in a statement.