John S. Cook has served as the Chief Information Officer of Hornbeck since May 2002. Mr. Cook was appointed Executive Vice President and Chief Commercial Officer in February 2013, and served as a Senior Vice President beginning in May 2008. Mr. Cook was initially designated an Executive Officer and appointed a Vice President of the Company in February 2006.

Before joining Hornbeck, Mr. Cook held roles of increasing responsibility in the business consulting section of Arthur Andersen LLP from January 1992 to May 2002, ultimately serving as a Senior Manager. During his consulting career, Mr. Cook assisted numerous marine and energy service companies in various business process and information technology initiatives, including strategic planning and enterprise software implementations.

Mr. Cook is an inactive certified public accountant in Louisiana and is a member of the American Institute of Certified Public Accountants and the Society of Louisiana Certified Public Accountants.