American Gas Association - The American Gas Association (AGA) is a trade organization composed of about 300 natural gas distribution, transmission, gathering and marketing companies in North America. AGA members account for more than 90% of the natural gas delivered in the United States. AGA acts as a clearinghouse for gas energy information, as a catalyst in technical and energy policy matters, and as a powerful voice for its members.

American Petroleum Institute - The American Petroleum Institute (API) is the U. S. petroleum industry's primary trade association. Its membership consists of a broad cross section of petroleum and allied industries in exploration, production, transportation, refining and marketing. API provides public policy development, advocacy, research and technical services to enhance the ability of the petroleum industry to fulfill its mission of meeting the nation's energy needs; enhancing the environmental, health, and safety performance of the petroleum industry; conducting research to advance petroleum technology; advocating government decision-making; and promoting public understanding of the industry's value to society.

Gas Processors Association - The Gas Processors Association (GPA) is an organization of operating and producing companies engaged in processing of natural gas. The GPA serves as the focal point of progress and the clearing-house of issues and developments in the gas processing industry.

Independent Petroleum Association of America - The Independent Petroleum Association of America (IPAA) is dedicated to ensuring a strong, viable domestic oil and natural gas industry. The national association represents 8,000 independent crude oil and natural gas explorer/producers in the United States.

International Association of Drilling Contractors - Since 1940, the International Association of Drilling Contractors (IADC) has exclusively represented the worldwide oil and gas drilling industry.

National Association of Convenience Stores - The National Association of Convenience Stores (NACS) is an international trade association representing more than 2,200 retail and 1,800 supplier company members. NACS member companies do business in nearly 50 countries worldwide, with the majority of members based in the United States. The U.S. convenience store industry, with 144,875 stores across the United States (as of December 31, 2008), posted $624 billion in total sales for 2008, with $450 billion in motor fuels sales.  NACS serves the convenience and petroleum retailing industry by providing industry knowledge, connections and advocacy to ensure the competitive viability of its members' businesses.

National Association of Royalty Owners - The National Association of Royalty Owners, Inc., (NARO) is a non-profit trade association dedicated to serving the needs of the nation's over 4 million owners of sub-surface oil and gas rights. NARO is the only national association for royalty owners and provides its over 5,000 members in 47 states with valuable and timely information necessary to the profitable management of this vital mineral asset. NARO is also the Voice That Counts for mineral and royalty owners in the nation's capital and in state houses in most of the producing states.

American Fuel & Petrochemical Manufactures - American Fuel & Petrochemical Manufactures (AFPM) is a trade association representing high-tech American manufacturers of virtually the entire U.S. supply of gasoline, diesel, jet fuel, other fuels and home heating oil, as well as the petrochemicals used as building blocks for thousands of vital products in daily life.

National Petroleum Council - The National Petroleum Council (NPC), a federally chartered and privately funded advisory committee, was established by the Secretary of the Interior in 1946 at the request of President Harry S. Truman. In 1977, the U.S. Department of Energy was established and the NPC's functions were transferred to the new Department. The purpose of the NPC is solely to advise, inform, and make recommendations to the Secretary of Energy with respect to any matter relating to oil and natural gas or to the oil and gas industries submitted to it or approved by the Secretary. The NPC does not concern itself with trade practices, nor does it engage in any of the usual trade association activities.

Natural Gas Supply Association - The Natural Gas Supply Association (NGSA) represents integrated and independent companies that produce and market domestic natural gas. Established in 1965, NGSA encourages expanded use of natural gas and a regulatory climate that fosters competitive markets.

Petroleum Marketers Association of America - The Petroleum Marketers Association of America (PMAA) is a federation of 41 state and regional trade associations representing approximately 10,000 independent petroleum marketers nationwide. The bulk of the marketers are small, family businesses serving the petroleum needs of their local community. These marketers sell approximately half of the gasoline, 60% of the diesel fuel and 80% of the home heating oil consumed in America.

Petroleum Technology Transfer Council - The Petroleum Technology Transfer Council (PTTC) was formed in 1994 by the U.S. exploration and production industry. The PTTC mission is to identify and transfer technology for the benefit of the domestic oil and natural gas industry.

Southern Gas Association - The Southern Gas Association links people, ideas and information in providing services and support activities which improve individual and corporate performance in the transmission, distribution, and marketing of natural gas service to all customers served by member companies.

Southwestern Legal Foundation - The Southwestern Legal Foundation is the only autonomous continuing legal education organization to sponsor an Inn of Court. For more than three decades, the Foundation has been the beneficiary of a distinguished group of supporters known as Research Fellows.

Texas Independent Producers and Royalty Owners - The Texas Independent Producers and Royalty Owners (TIPRO) is committed to promoting the interests and general welfare of independent producers and royalty owners in Texas. The association concentrates its efforts in government relations, public communications and business services. TIPRO strives to provide members with outstanding legislative and public representation, access to valuable business information, and excellent networking opportunities.