John joined Greylock as a partner in 2011. John is currently on the Board of Directors of Figma, Quip, DWNLD, ClearSlide, Jack Mobile, Sparks Mobile, Code for America, and other unannounced investments. He leads Greylock’s investment in Dropbox and led our investments in Tumblr (acquired by Yahoo in 2013) and Instagram (acquired by Facebook in 2012). John previously served on the boards of directors of TripIt (acquired by Concur in 2011), CenterRun (acquired by Sun Microsystems in 2003), and Reactivity (acquired by Cisco Systems in 2007).
Prior to Greylock, John was CEO of Mozilla, the organization behind Firefox, the open source Web browser 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. Earlier in his career, John held positions on the executive team at Trilogy Software and as a Senior Scientist in Apple’s research labs.
John holds a BS in Computer Systems Engineering and an MS in Computer Science with a focus on Human Computer Interaction, both from Stanford University. He is a Consulting Assistant Professor at Stanford’s d.school, and an advisor to both the Stanford Technology Ventures Program and StartX, Stanford’s start up accelerator.
He is a co-inventor on seven United States patents.