Call him the unofficial U.S. ambassador to Silicon Valley. As director of the Defense Innovation Unit within the U.S. Department of Defense, Mike Brown is tasked with bridging the gap between technology innovators and the U.S. government. Formerly CEO of Symantec, Brown knows the significant opportunity public-private partnerships can offer entrepreneurs – if structured for speed not bureaucracy – and he's been setting up new ones at a rapid clip. He also knows the intense need to keep the U.S. government on the leading edge of tech, for cost reasons and competitive ones. Brown has a keen eye on China’s tech-and-government efforts, and the potential impact on U.S. companies and U.S. national security. Bringing the best of commercial tech into the government, Brown says, isn’t just a nice to have but a need to have.