This document profiles four influential female leaders in the digital age: Marissa Mayer, CEO of Yahoo, who spent 13 years at Google; Sheryl Sandberg, COO of Facebook and former Google executive; Jessica Lessin, founder and editor-in-chief of tech news site The Information; and Oprah Winfrey, media mogul and founder of OWN television network, who has been named one of TIME's most influential people multiple times.