GaN Systems has hired Jim Witham as CEO. Girvan Patterson and John Robert, the company’s co-founders, will remain in their current positions as president and chief technical officer, respectively. Prior to joining GaN Systems, Witham worked at Neoconix where he served as president and CEO. Based in Ottawa, Ontario, GaN Systems is a producer of gallium nitride power switching semiconductors. It is backed by Chrysalix Energy Venture Capital and RockPort Capital.