Sheryl Kara Sandberg (born August 28, 1969) is an American business executive, billionaire and philanthropist. Sandberg serves as the Chief Operating Officer (COO) of Facebook and the founder of LeanIn.Org. In June 2012, she was elected to Facebook's Board of Directors, becoming the first woman to serve on its board. Prior to joining Facebook as its COO, Sandberg was Vice President of Global Online Sales and Operations at Google, and was involved in its philanthropic arm Google.org. Before that, Sandberg served as Chief of Staff for United States Secretary of the Treasury, Lawrence Summers.