Symphony Wireless hires Bernard Borghei, ex-Tower Engineering Professionals, as CEO ... Family entertainment company WildBrain adds Norton Rose’s Mark Trachuk, also former Entertainment One, as general counsel and as corporate secretary to WildBrain’s board, succeeding James Bishop, departed ... DoorDash adds former Amazon executive Jeffrey Blackburn to its board, effective May 8; Netflix co-CEO Greg Peters won’t stand for reelection to DoorDash board when his term expires at June’s annual meeting ... The Arena Group promotes Sara Silverstein to CEO; former CEO Cavitt Randall remains chairman ... Contrast Security, application security vendor, hires Shay Mowlem, ex-NinjaOne, as chief marketing officer.