Prior to joining Greylock in 2011, Mr. Lilly was CEO of Mozilla, the organization behind Firefox, an open source Web browser used by more than 450 million people. He also co-founded Reactivity, an enterprise security infrastructure company acquired by Cisco in 2007, where he served as founding CEO and later CTO.

He is currently on the Board of Directors of Citrus Lane, Clearslide, Code for America, Mozilla Corporation, and the Participatory Culture Foundation. He is a board observer at Tumblr, lead's Greylock's investment in Dropbox, and led the investment in Instagram. He is a co-inventor on seven United States patents.

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