John Lilly is a Partner at Greylock Partners, one of the world's leading venture funds of the past decade. At Greylock John has led investments in the likes of Instagram (acq by Facebook), Tumblr (acq by Yahoo) and Dropbox. John also sits on the board for Quip, Figma and ClearSlide just to name a few. Prior to Greylock, John was CEO of Mozilla, the organization behind Firefox, used by more than 450 million people. John also co-founded Reactivity, an enterprise security infrastructure company acquired by Cisco in 2007, where he served as founding CEO and later CTO.