HD has focused on vulnerability research, network discovery, and software development since the 1990s. He is most recognized for creating Metasploit and is a passionate advocate for open-source software and vulnerability disclosure. HD serves as the CEO and co-founder of runZero, a provider of cutting-edge cyber asset attack surface management (CAASM) software and cloud services. Prior to founding runZero, he held leadership positions at Atredis Partners, Rapid7, and BreakingPoint. HD's professional journey began with exploring telephone networks, developing exploits for the Department of Defense, and breaking into financial institutions. When he's not working, he enjoys hacking on weird Go projects, building janky electronics, running in circles, and playing single-player RPGs.