This document profiles four influential female leaders in the digital age: Sheryl Sandberg, COO of Facebook and author of "Lean In"; Jessica Lessin, founder and editor-in-chief of tech news site The Information; Oprah Winfrey, former TV host and founder of OWN network; and Marissa Mayer, current CEO of Yahoo who previously spent 13 years at Google. Brief biographies and accomplishments of each woman are provided.