Ravi Jain is an engineering manager at Google, Mountain View, California, currently focusing on mobile engineering efforts in mobile advertising. At Google he has also led the efforts on location based services, and syndicated mobile search. Previously, from 2002 to 2005, he was Vice President and Director of the Network Services and Security Lab in DoCoMo USA Labs. At DoCoMo he led the US team designing DoCoMo's 4th generation (4G) core network in three key areas: mobility management, QoS and security. From 1992 to 2002 he was in Applied Research, Telcordia Technologies (formerly Bellcore) working on mobile wireless architectures, algorithms, protocols and middleware, as well as open programmable networks. Prior to that he worked for several years on systems and communications software development, performance modeling, and parallel programming.