(Pictured above: Sheryl Sandberg, Chief Operating Officer of Facebook and Nancy Gibbs, Deputy Managing Editor of TIME, at last night’s Lean In book launch event.)

Last night at Time Warner Center, Sheryl Sandberg – Facebook COO, first-time author, and now the subject of this week’s TIME magazine cover story – drove home her message about what’s keeping women from achieving parity in the workplace.

In a wide-ranging conversation moderated by TIME Deputy Managing Editor Nancy Gibbs, before an audience of notables including Katie Holmes, Gayle King, Suze Orman and 60 Minutes correspondent Leslie Stahl, Sandberg discussed her book, Lean In: Women, Work and the Will to Lead, which went on sale yesterday.

In the book, Sandberg examines why women’s progress in achieving leadership roles has stalled, offers her explanation for the root causes and suggests compelling, commonsense solutions that can empower women to achieve their full potential.

“I got on the TED stage two-and-a-half years ago and said, ‘The blunt truth is, men run the world,’ and you could hear the audience gasp; as if that was news,” Sandberg told the audience. “Warren Buffett has generously said that one of the reasons he was so successful is that he was only competing with half the population. And when we go to fill our leadership ranks – let’s be clear – we’re still sourcing from basically half the population.”

For more of Sandberg’s insights, read about the event at TIME.com, and see video and photos from the event below.

(CBS This Morning anchor Gayle King)

(TIME Managing Editor Rick Stengel and Suze Orman)

(Ann Curry watches from the audience.)