Brad Mattson (born October 29, 1954) is an American engineer and entrepreneur. He started two publicly traded semiconductor companies, Novellus Systems and Mattson Technology, and has also worked in the solar power industry. He currently serves as Chairman of Husk Power and is a board director at Siva Power, a thin film solar cell company based in Silicon Valley, and is involved with several other private companies and non-profits. Mattson holds 12 patents.