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Executive Biographies

John M. Duffey
President and Chief Executive Officer
Biography PhotoJohn M. Duffey
President and Chief Executive Officer


John M. Duffey was named President and Chief Executive Officer, and a Director of Six Flags in February 2016. From September 2010 to February 2016, he served as Chief Financial Officer of the company. Mr. Duffey previously served as Executive Vice President and Chief Integration Officer of Siemens Healthcare Diagnostics from November 2007 to January 2010, and was responsible for leading the integration of Siemens Medical Solutions Diagnostics and Dade Behring. Prior to Dade Behring’s acquisition... 
Lance  C. Balk
General Counsel
Biography PhotoLance  C. Balk
General Counsel


Lance C. Balk was named General Counsel of Six Flags in September 2010. Mr. Balk previously served as Senior Vice President and General Counsel of Siemens Healthcare Diagnostics from November 2007 to January 2010. Prior to Dade Behring’s acquisition by Siemens AG, he served in the same capacity at Dade Behring Inc. from May 2006 to November 2007. In these roles Mr. Balk was responsible for global legal matters. Before joining Dade Behring, Mr. Balk was a partner at the law firm Kirkland & El... 
Marshall Barber
Chief Financial Officer
Biography PhotoMarshall Barber
Chief Financial Officer


Marshall Barber was named Chief Financial Officer of Six Flags in February 2016 and is responsible for the finance and information technology functions in the company. Mr. Barber previously served as Vice President of Business Planning for the company from July 2006 to February 2016. He also held various other park-level and corporate-level financial positions since joining Six Flags in October 1996. Prior to joining the company, Mr. Barber held financial positions at FoxMeyer Drug and G. D. Sea... 
Walt Hawrylak
Senior Vice President, Administration
Biography PhotoWalt Hawrylak
Senior Vice President, Administration


Walter S. Hawrylak was named Senior Vice President, Administration of Six Flags in June 2002 and is responsible for Human Resources, Benefits, Training, Risk Management, Safety and Insurance. He joined Six Flags in 1999 bringing a rich background in the theme park industry. He previously worked for Sea World, Universal Studios and Wet N Wild where he has held a variety of positions ranging from Director of Finance to General Manager to CFO. Mr. Hawrylak holds a B.A. degree in Accounting from ... 
Michael  S. Israel
Senior Vice President and Chief Information Officer
Biography PhotoMichael  S. Israel
Senior Vice President and Chief Information Officer


Michael S. Israel was named Chief Information Officer of Six Flags in April 2006 and is responsible for managing and updating the Company’s Information Systems infrastructure. Mr. Israel began his career in technology sales and in 1998 became Chief Operating Officer for AMC Computer Corp. – a high-end, solutions-based systems integration consulting firm, and then served as a consultant at Financial Security Assurance from October 2004 to April 2006. Prior to this, he was Vice President of Word... 
Tom Iven
Senior Vice President, U.S. Park Operations
Biography PhotoTom Iven
Senior Vice President, U.S. Park Operations


Tom Iven was named Senior Vice President, U.S. Park Operations for Six Flags in April 2014 and is responsible for managing all operating functions for the company’s 15 U.S. parks and hotel/indoor water park. Mr. Iven began his career at Six Flags in 1976 as a seasonal employee and became a full-time employee in 1981. He held a number of management positions within several parks including Six Flags Magic Mountain and Six Flags Over Texas before being named General Manager of Six Flags St. Louis i... 
Nancy A. Krejsa
Senior Vice President, Investor Relations and Corporate Communications
Biography PhotoNancy A. Krejsa
Senior Vice President, Investor Relations and Corporate Communications


Nancy A. Krejsa was named Senior Vice President, Investor Relations and Corporate Communications at Six Flags in October 2010 and is responsible for investor relations, corporate communications and public relations. Ms. Krejsa previously served as Senior Vice President, Strategy and Communications for Siemens Healthcare Diagnostics from November 2007 to September 2010. Prior to Siemens’ acquisition of Dade Behring, Ms. Krejsa was responsible for Corporate Communications and Investor Relations ... 
David McKillips
Senior Vice President, In-Park Services
Biography PhotoDavid McKillips
Senior Vice President, In-Park Services


David McKillips was named Senior Vice President, In-Park Services, of Six Flags in January 2016 and is responsible for culinary, retail, games, rentals, parking and other services offered throughout the company’s 18 parks. Mr. McKillips had previously served as Senior Vice President, Corporate Alliances since September 2010. Mr. McKillips has 20 years of experience in the entertainment and theme park industry, specializing in promotion, sponsorship and consumer product licensing sales. Prior t... 
John Odum
Senior Vice President, International Park Operations
Biography PhotoJohn Odum
Senior Vice President, International Park Operations


John Odum was named Senior Vice President, International Park Operations for Six Flags in April 2014 and is responsible for the development and management of all properties outside the United States. Additionally he oversees the corporate design, engineering, maintenance, operations, aquatics, and entertainment functions for all parks. Mr. Odum began his career with Six Flags in 1974 where he held multiple supervisory and management positions within the areas of entertainment, rides, park servic... 
Brett Petit
Senior Vice President, Marketing & Sales
Biography PhotoBrett Petit
Senior Vice President, Marketing & Sales


Brett Petit was named Senior Vice President, Marketing & Sales, of Six Flags in June 2010 and is responsible for all aspects of the company’s marketing strategy, advertising, promotions, group sales, online marketing, corporate sponsorships, media networks and licensed promotions. Over the course of his 33 years of experience in the theme and water park industry, Mr. Petit has managed marketing strategy for more than 65 different theme parks, water parks and family entertainment centers across t... 
Leonard A. Russ
Senior Vice President of Strategic Planning and Analysis
Biography PhotoLeonard A. Russ
Senior Vice President of Strategic Planning and Analysis


Leonard A. Russ was named Senior Vice President of Strategic Planning and Analysis in February 2016. Since October 2010 he was Vice President and Chief Accounting Officer of Six Flags where he was responsible for overseeing the Company's accounting function and the finance functions of the western region parks. Mr. Russ began his career at Six Flags in 1989 as a seasonal employee and became a full-time employee in 1995. He held a number of management positions within the Company before being na...