Who is the highest ranking officer in a corporation?

The Chief Executive Officer, CEO is the highest ranking officer in a corporation. He is higher than the CFO (chief financial officer) and the COO (chief operations officer) and the CIO (chief information officer) and the CSO (chief security officer), who all report to him, and to the Board of Directors. The Board of Directors are not officers of the corporation, but they are the final decision makers for the business.