Jeff Spence is the freshly minted CEO of NexDefense. The Atlanta-based startup develops software that protects industrial control systems - computer systems that control electric plants, nuclear reactors, oil-and-gas equipment and military equipment - from cyber attack. The company, backed by serial entrepreneur Tom Noonan, has raised about $5 million. Prior to joining NexDefense, Spence was the managing director of DraftServ Pty Ltd of Singapore and was investment director of a Zurich-based...