Joe Grand is an American electrical engineer, inventor, and hardware hacker, known in the hacker community as Kingpin. He achieved mainstream popularity after his appearance on Prototype This!, a Discovery Channel television show. He specializes in, "finding security flaws in hardware devices and educating engineers on how to increase the security of their designs". Grand has testified before the U.S. Senate Committee on Governmental Affairs regarding government and homeland computer security under his internet handle, Kingpin.