GDD & Associates was incorporated in the state of Oklahoma in 1975 with its office in Tulsa, Oklahoma for the purpose of providing engineering, management, acquisition and consultant services pertaining to the oil and gas industry. GDD & Associates provides a range of services for partnerships, trusts, corporations, and individuals whose portfolio consists of non-operated working interests, royalty interests, net profit interests, overriding royalty, and mineral interests throughout the United States. No matter the size of your mineral asset portfolio, our services can be customized to fit all of your needs.