Derryberry & Naifeh, LLP

American International Group (AIG); American Honda Finance Co.; American Insurance Association (AIA); American Premium Brands, Ltd.; American Resource Mortgage, Inc.; Aramark Corporation, Inc.; Association of County Commissioners; BancFirst Corporation; Bank One Credit Company; Bituminous Insurance Companies; Blackledge & Associates; Caterpillar Financial Services; CompSource Oklahoma; Continental Casualty Company (CNA); Dodge Town, U.S.A.; DRC, Inc.; Fairmont Specialty Group; First National Center, L.L.C.; Home Creations; Hooters of America, Inc.; Humana, Inc.; Hyundai Motor Finance, Co.; Hyatt Legal Plan; Ideal Homes; International Fidelity Insurance Company; Interstate Hotels; J.C. Potter Company; Lake Region Electric Cooperative; National Association of Sonic Drive-Inn's; National Council on Compensation Insurance (NCCI); Nissan Motor Acceptance Corp.; Northfork Electric Cooperative; Oklahoma Association of Electric Cooperatives; Oklahoma Employers Safety Group; Oklahoma Farm Bureau Mutual Insurance Company; Oklahoma Management Group; Oklahoma Property and Casualty Insurance Guaranty Association; Oklahoma Real Estate Appraiser Board; Oklahoma R.E.&T. Credit Union; Oklahoma State Bank; ONYX Acceptance Corp.; Pharmcare OK, Inc.; Plantation Village Assisted Living Center; Plantation Village Nursing Center; Progressive Insurance Company; Ranger Insurance; Rexair, Inc.; Rural Electric Cooperative; SMC Consulting Engineers; Southwest Health Care; State of Oklahoma Insurance Department; Summit Life Corporation; Sunray Oil Company; Teachers Insurance & Annuity Association (TIAA-CREF); The Oklahoma Petroleum Workers Compensation Association (TOPWCA); The Oklahoma State Chamber of Commerce; UMB Bank; Vantage Open MRI, L.L.C.; Walgreen Drug Stores; Wal-Mart Stores, Inc.; Western Farmers Electric Cooperative.