CDK Global Names David Hahn Chief Information Security Officer HOFFMAN ESTATES, Ill.--(BUSINESS WIRE)--CDK Global, Inc. (Nasdaq: CDK), a leading retail automotive technology company, announced today that David Hahn has joined the company as chief information security officer (CISO). He will also be a member of the executive leadership team. In his role, Hahn is responsible for developing a global strategy and executing the roadmap for managing technology risk and information security across the company’s IT, product engineering, and research and developmen