Piero Ruffinengo

Appalachian Power Co. engages in the generation, transmission and distribution of electric power to retail customers in the south-western portion of Virginia. It also supplies and markets electric power at wholesale to electric utility companies, municipalities and other market participants. The company was founded in 1926 and is headquartered in Columbus, OH.

Transcontinental Gas Pipe Line Co. LLC is an interstate natural gas transmission company, which owns a natural gas pipeline system extending from Texas, Louisiana, Mississippi and the Gulf of Mexico through Alabama, Georgia, South Carolina, North Carolina, Virginia, Maryland, Delaware, Pennsylvania and New Jersey to the New York City metropolitan area. Its customers include public utilities and municipalities that provide service to residential, commercial, industrial and electric generation end users. The company was founded on October 5, 1948 and is headquartered in Houston, TX.

MarkWest Hydrocarbon LLC provides natural gas processing services. It also provides transportation, fractionation, and storage of natural gas liquids and transportation of crude oil. The company was founded by John M. Fox in April 1998 and is headquartered in Denver, CO.

Wiltel Communications Group, Inc. provides customized communications solutions to enterprises, and federal government. The company was founded by Robert D. Williams and is headquartered in Tulsa, OK.

Part of Marathon Petroleum Corp., MarkWest Energy GP LLC is a company that provides oil and gas field services not elsewhere classified. The company is based in Englewood, CO. The company was founded by John C. Mollenkopf.

Part of The Williams Cos., Inc., Williams Gas Pipeline Co. LLC transmits natural gas.

Associated Electric & Gas Insurance Services Ltd. provides underwriting, claims, and loss control services to member companies on an individual basis. Associated Electric & Gas Insurance Services is based in New York, NY, and has subsidiaries in Bermuda, United States, Canada, and United Kingdom. The policies are tailored to fit the specific needs of each member company at a fair price that accurately reflects the risk. The private company offers deep expertise and a wide range of loss control products, services, and educational opportunities that can't be matched by commercial insurers.

FJ Management, Inc. operates gas stations, explores, refiness and distributes petroleum products. The company was founded by O. Jay Call in 1968 and is headquartered in Salt Lake, UT.

Arthur Andersen LLP used to provide accounting services. It was also into consulting services for clients that operate businesses throughout the United States and around the world. Arthur Andersen was founded in 1913 and was headquartered in Chicago, IL.

Oklahoma Independent Petroleum Association operates as an oil and natural gas association. The company was founded in 1955 and is headquartered in Oklahoma City, OK.

Part of NGL Energy Partners LP, NGL Energy Holdings LLC functions as an investment holding company. The company is based in Tulsa, OK. H. Michael Krimbill has been the CEO of the company since 2010.

Part of Pluspetrol Resources Corp, Apco Properties Ltd. is a Caymanian company.

NGL Crude Logistics LLC provides physical distribution, merchandising and trading services. The company was founded on April 24, 2002 and is headquartered in Houston, TX.

NGL Water Pipelines LLC engages in the operation of propane and other natural gas businesses. The company is headquartered in Tulsa, OK.

The Natural Gas Supply Association produce and market natural gas. The firm encourages the use of natural gas within a balanced national energy policy, and promotes the benefits of competitive markets to ensure transportation and delivery of natural gas and to the supply of natural gas to US customers. The company was founded in 1965 and is headquartered in Washington, DC.

Security National Life Insurance Co. provides insurance services. It offers funeral home and agency solutions, prepaid funerals, and final expense and driver's insurance. The company was founded by George R. Quist, Sr. in 1965 and is headquartered in Salt Lake, UT.

Insurance Accounting & Systems Association, Inc. operates as a a non-profit organization that offers educational venues to its members in the form of conferences, publications, and seminars. The company was founded in 1928 and is headquartered in Durham, NC.

The American Institute of Certified Public Accountants provides vocational education in accounting. The company provides services to the accounting community, regulatory bodies, and other organizations. It also operates in Jersey City, Washington, and Lewisville. It was founded in 1887 and is headquartered in New York City, NY.

American Association of Professional Landmen consists of landmen and land-related persons throughout affiliated local associations in the United States and in Canada. It promotes standards of performance for all land professionals, which encourage responsible stewardship of energy and mineral resources. The company was founded on March 17, 1987 and is headquartered in Fort Worth, TX.

The Independent Petroleum Association of America manufactures oil and natural gas. The non-profit company is based in Washington. Barry Russell has been the CEO of the American company since 1980.

Part of The Williams Cos., Inc., Williams Natural Gas Co. is a company that engages in extracting natural gas. The company is based in Tulsa, OK.

BOKF, NA, do-business-as BOK Financial, is an asset management firm headquartered in Tulsa, Oklahoma. The firm is a subsidiary of BOK Financial Corp. (NASDAQ: BOKF). BOKF offers trust and investment management services through their banks and subsidiary.

National Cowboy & Western Heritage Museum operates as a museum. It focuses on the American cowboy, rodeos, native American culture, Victorian firearms, frontier military, and western performers. The company was founded in 1955 and is headquartered in Oklahoma City, OK.

Associated Electric & Gas Insurance Services Ltd. provides liability and property coverage, and related risk management services to the energy industry. It offers underwriting, claims, and loss control services. The company was founded in 1971 and is headquartered in Hamilton, BM.

GTI Energy provides research, development and training services for the natural gas industries. It offers research and development, program management, technical services, analytical services, consulting, commercialization, training and information services. The company was founded in April 2000 and is headquartered in Des Plaines, IL.