Steven Walker is vice president and chief technical officer of Lockheed Martin Corp. Prior to joining Lockheed Martin, in 2020, he held various engineering leadership roles during a 30-year career in the U.S. government, including director of the Defense Advanced Research Projects Agency (DARPA), deputy director of DARPA, and Deputy Assistant Secretary of the Air Force for Science, Technology and Engineering. A senior member of the IEEE, he began his career in the era of 2G wireless networks.