Rick Lu is a defense tech investor at Sum Ventures who previously founded and led multiple classified RF and electronic warfare startups (NetworkFab and Spectranetix) that built advanced systems for the U.S. Department of Defense before successful acquisitions, and was an early architect of the Modular Open Systems Architecture standards that became central to modern defense technology. He serves as Chairman of the Defense, Intelligence & Aerospace group at Band of Angels while remaining Chief Strategy Officer at Pacific Defense, giving him the rare combination of being an active builder inside a major defense company and an investor who helps early-stage defense founders navigate government contracting and SBIR commercialization.