I was lucky enough to interact with Sheryl Sandberg a few times while I was an intern at Facebook from June 2009-June 2010. As the company’s COO, she works very closely with Mark and the rest of Facebook’s management team to balance the well-being of 500 million+ users, as well as grow the company’s monetization efforts. Although I frequently was only watching from afar, I was consistently blown away by her effective leadership style. She was one of the most important (and busy, I’m sure) members of the company, yet she still had time to joke around with her colleagues, patiently articulate ideas, and seek insight from the intern perspective. In particular, I noticed Sheryl was very passionate about issues of women in the workforce, and she made it a personal goal to ensure Facebook is a company where women can thrive. It was therefore with no surprise that I recently discovered she gave a TED Talk in December about the lack of women leaders, an earlier version of which I saw her give at Facebook. Even if you don’t think you’re interested in women’s issues I highly recommend you check it out – Sheryl uses great examples and research studies to illustrate an extremely important and troubling phenomenon.