Jack received his B.S. and M.S. degrees in electrical engineering from North Carolina State University in 1994 and 1998, respectively. As part of the Communications and Network Technologies Group of the Johns Hopkins University Applied Physics Laboratory (JHU/APL), he currently leads a team of engineers focused on assessing and improving the performance of wireless networking technologies through test, evaluation, and technical innovation. His primary expertise is in the areas of wireless networking and modeling and simulation, focusing on the application and evaluation of wireless networking technologies in the military context. His recent work has focused on the areas of wireless network electronic attack, wireless network security, and cognitive radio networking. He has published numerous technical papers and book chapters on topics of wireless networking, regularly acts as a technical reviewer for journals and magazines, and is a co-author of an upcoming book on the subject of modeling and simulation. He teaches courses on the topics of networking and wireless networking in the Johns Hopkins University Part Time Engineering Program, and is a member of the ASEE.