Matthew Fitzgerald has joined its Board of Directors and will also serve as Chairman of its Audit Committee.

Zwart will oversee all commercial aspects of Ridgewood Energy’s offshore oil and gas activities, including matters of land management, oil and gas marketing and planning.

Kenneth K. Conte will serve as Vice President and Chief Financial Officer of Frontier.

Crist has a broad range of managerial and technical expertise that includes 25 years in corporate and senior management roles.

Steven H. Pruett is joining the company as senior vice president of Corporate Development.

Charles W. "Chip" Goodyear will begin serving as an independent director of the company, effective March 1.

Americas Styrenics LLC is a joint venture between Chevron Phillips Chemical Company LP and Styron.

Harris' extensive experience leading HR teams includes assignments as executive vice president and senior vice president of human resources with Texas Genco LLC, a wholesale power generator company; senior vice president of human resources and administration of Integrated Electrical Services, Inc.; and vice president at Santa Fe Snyder Corp., an independent exploration and production company.

The new directors were appointed in connection with Dune's financial restructuring, which was consummated on December 22, 2011.

Crestwood also announced the addition of Robert T. Halpin, Vice President of Business Development, to Crestwood's general partner executive team.