Marc Najork is a Senior Director of Research Engineering in Google Research. Before joining Google, Marc was a Principal Researcher at Microsoft Research (2001-2014) and prior to that a Researcher at the DEC/Compaq Systems Researcher Center (1993-2001). Marc earned a Ph.D. in Computer Science from the University of Illinois. He is an ACM Fellow, an IEEE Fellow and a member of the SIGIR Academy. His service activities include Editor-in-Chief of the ACM Transactions on the Web (2011-2014), news board co-chair of the Communications of the ACM (2008-2014), conference chair of WSDM 2008, and program co-chair of WWW 2004 and WWW 2021.