Appendix 1: Classification of Actors in Congressional Hearing Network. Table (1): The Actors of the First Tier in the Congressional Hearing Network. Degree Type of Abbreviations Names Centrality Interest CAPAF Center for American Progress 21 Scientists API American Petroleum Institute 83 Oil IPAA Independent Petroleum Association of America 44 Oil BP BP America, BP captil, Olympic PipeLine Co, and BP Kwinana 40 Oil American Fuel and Petrochemical Manufacturers and National AFPM Petrochemical & Refiners Association (NPRA) 29 Oil Shell Shell Oil Co. 29 Oil INGAA Interstate Natural Gas Association of America 25 Oil AGA American Gas Association 23 Oil AOPL Association of Oil PipeLines AOPL 19 Oil NSWA National Stripper Well Association 19 Oil DOE U. S. Department of Energy 75 Officials EIA Energy Information Administration 68 Officials DOI U. S. Department of The Interior 57 Officials GAO Government Accountability Office 44 Officials EPA U. S. Environmental Protection Agency 42 Officials Bureau of Ocean Energy Management, Regulation, and BOEMRE Enforcement, previously named Minerals Management Service 38 Officials (MMS) USCG U.S. COAST GUARD 36 Officials BLM Bureau of Land Management 34 Officials NOAA National Oceanic and Atmospheric Administration 23 Officials PHMSA Pipeline and Hazardous Materials Safety Administration 23 Officials DOT U. S. Department of Transportation 22 Officials NRDC Natural Resources Defense Council 33 Environment Table (2): The Actors of the Second Tier in the Congressional Hearing Network. Degree Type of Abbreviations Names Centrality Interest CSIS Center for Strategic and International Studies. 18 Scientists HIS.CERA3 IHS Cambridge Energy Research Associates 16 Scientists IHS IHS, Inc. or IHS Markit and Global Insight, Inc. 13 Scientists 1 LSU3 Louisiana State University 12 Scientists MIT3 Massachusetts Institute of Technology 11 Scientists P.Citizen Public Citizen 11 Scientists RICE3 Rice University 11 Scientists UM3 University of Maryland 11 Scientists Berkeley3 University of California, Berkeley 7 Scientists Brookings Brookings Institution 6 Scientists CU33 Columbia University 6 Scientists EPRINC Energy Policy Research Foundation, INC 6 Scientists HF Heritage Foundation 6 Scientists IER3 Institute for Energy Research 6 Scientists RAND RAND Corp 6 Scientists American Enterprise Institute for Public Policy AEI 5 Scientists Research. CEIP Carnegie Endowment for International Peace 5 Scientists CFR3 Council on Foreign Relations 5 Scientists CNAS Center for a New American Security 5 Scientists Harvard Harvard University 5 Scientists NRC National Research Council 5 Scientists RFF Resources for the Future 5 Scientists UNH3 University of New Hampshire 5 Scientists USC3 University of South Carolina 5 Scientists UT3 University of Texas 5 Scientists CFA Consumer Federation of America 15 Others Alliance of Automobile Manufacturers and Auto Alliance 11 Others Alliance National Association of Regulatory Utility NARUC 11 Others Commissioners AAA American Automobile Association 10 Others Air Transport Association of America and Airlines for ATA10 10 Others America U.S.PIRG U.S. Public Interest Research Group 10 Others NMA National Mining Association 9 Others NYMEX New York Mercantile Exchange 9 Others ATA American Trucking Associations 8 Others CU10 Consumers Union 7 Others CME CME Group 6 Others ICE IntercontinentalExchange (ICE) 6 Others AAR Association of American Railroads 5 Others Deutsche Deutsche Bank. 5 Others Motivatit Motivatit Seafoods, L.L.C. 5 Others OOIDA Owner-Operator Independent Drivers Association 5 Others 2 T4CS Taxpayers for Common Sense 5 Others Chevron Chevron 18 Oil ExxonMobil Exxon Mobile Corporation 18 Oil NACS National Association of Convenience Stores 15 Oil Society of Independent Gasoline Marketers of SIGMA 14 Oil America APGA American Public Gas Association 12 Oil NOIA National Ocean Industries Association 12 Oil ConocoPhillips ConocoPhillips Alaska, Inc. or ConocoPhillips Co. 11 Oil PMAA Petroleum Marketers Association of America 11 Oil American Exploration and Petroleum Council, AXPC American Exploration and Production Council, and 10 Oil Domestic Petroleum Council Transocean Transocean, Ltd. offshore drilling company 10 Oil Independent Petroleum Association of Mountain IPAMS 9 Oil States PFCEnergy PFC Energy 9 Oil Marathon Marathon Oil Corporation 8 Oil NGSA Natural Gas Supply Association 8 Oil WEA Western Energy Alliance 8 Oil Continental Continental Resources 7 Oil devon Devon Energy Corp 7 Oil Diamond Diamond Shamrock, Inc. and Valero Energy Co. 7 Oil Shamrock AAPG American Association of Petroleum Geologists 6 Oil Halliburton Halliburton Co, and Halliburton Energy Services. 6 Oil IADC International Association of Drilling Contractors 6 Oil ClearView ClearView Energy Partners, LLC 5 Oil iea International Energy Agency (IEA) 5 Oil IOGCC Interstate Oil and Gas Compact Commission 5 Oil OMSA Offshore Marine Service Association 5 Oil PIRF Petroleum Industry Research Foundation 5 Oil DOS United States Department of State (DOS) 17 Officials FTC Federal Trade Commission 17 Officials USGS Geological Survey 17 Officials National Transportation Safety Board and Research NTSB 14 Officials and Special Programs Administration (RSPA) Land and Minerals Management , Department of the LMM.DOI 13 Officials Interior EERE Energy Efficiency and Renewable Energy Office 12 Officials DOD U. S. Department of Defense 11 Officials CFTC Commodity Futures Trading Commission 10 Officials 3 National Association of Pipeline Safety NAPSR 10 Officials Representatives USFS U. S. Forest Service 10 Officials BSEE Bureau of Safety and Environmental Enforcement 9 Officials FERC The Federal Energy Regulatory Commission (FERC) 9 Officials BOEM Bureau of Ocean Energy Management 8 Officials CRS Congressional Research Service 8 Officials LDNR Louisiana Department of Natural Resources 8 Officials OCC Oklahoma Corporation Commission 8 Officials USDA U.S. Department of Agriculture 8 Officials Department of Mineral Resources , North Dakota DMR.NDIC 7 Officials Industrial Commission DMR.NDIC DNR.AK Alaska Department of Natural Resources DNR.AK 7 Officials EDA Economic Development Administration 7 Officials GLPC Greater Lafourche Port Commission 7 Officials Arctic Slope Regional Corporation and ASRC ASRC 6 Officials Exploration, LLC CIA Central Intelligence Agency 6 Officials DA U. S. Department of Army 6 Officials DoN U. S. Department of Navy 6 Officials Frank MURKOWSKI , Frank H. (SENATOR , REPUBLICAN -AK) 6 Officials MURKOWSKI FWS Fish and Wildlife Service 6 Officials National Commission on the BP Deepwater Horizon NConBP 6 Officials Oil Spill and Offshore Drilling NREL National Renewable Energy Laboratory 6 Officials RRC Railroad Commission of Texas 6 Officials TREAS Department of Treasury 6 Officials AG.CT Attorney General, Connecticut. 5 Officials DAF U. S. Department of Air Force 5 Officials DHS U. S. Department of Homeland Security 5 Officials GCCF Gulf Coast Claims Facility 5 Officials Governor.AK Governor, Alaska 5 Officials Lafourche.LA Lafourche Parish, La. 5 Officials RSPA Research and Special Programs Administration (RSPA) 5 Officials USACE United States Army Corps of Engineers or ( CoE ) 5 Officials PST Pipeline Safety Trust PST 13 Environment SierraClub Sierra Club 13 Environment WS The Wilderness Society 12 Environment Oceana Oceana 10 Environment NWF National Wildlife Federation 9 Environment EDF Environmental Defense Fund 8 Environment 4 UCS Union of Concerned Scientists 7 Environment AlaskaWilderness Alaska Wilderness League 6 Environment OC Ocean Conservancy 6 Environment Trout Trout Unlimited 6 Environment ALA American Lung Association 5 Environment CInletKeeper Cook Inlet Keeper. 5 Environment FOE Friends of the Earth 5 Environment Pew Environment Group, and The Pew Charitable PEW 5 Environment Trusts WRI World Resources Institute 5 Environment ASE Alliance to Save Energy 11 Energy ESLC Energy Security Leadership Council 8 Energy Institute for 21st Century Energy , Chamber of I21stCE 8 Energy Commerce of the U.S. ACEEE American Council for an Energy-Efficient Economy. 7 Energy IECA Industrial Energy Consumers of America 6 Energy AWEA American Wind Energy Association 5 Energy ESA Energy Security Analysis. 5 Energy IAGS Institute for the Analysis of Global Security 5 Energy Sim&Com. Simmons & Company International. 5 Energy RFA Renewable Fuels Association 11 Biofuel Table (3): The Actors of the Third Tier in the Congressional Hearing Network. Degree Type of Abbreviations Names Centrality Interest CU3 Cornell University 4 Scientists Manhattan.IPR3 Manhattan Institute for Policy Research 4 Scientists Mines3 Colorado School of Mines 4 Scientists TAMU3 Texas A&M University. 4 Scientists UCDAVIS3 University of California, Davis 4 Scientists USF3 University of South Florida 4 Scientists UTA3 University of Texas at Austin 4 Scientists AAI American Antitrust Institute 3 Scientists BPC Bipartisan Policy Center 3 Scientists Cato Cato Institute 3 Scientists CNA Center for Naval Analy 3 Scientists CSC3 Colby-Sawer College 3 Scientists Duke3 Duke University 3 Scientists FIU3 Florida International University 3 Scientists GW3 George Washington University 3 Scientists 5 jhu3 Johns Hopkins University 3 Scientists SMU3 Southern Methodist University 3 Scientists Stanford3 Stanford University, 3 Scientists TNSP Truman National Security Project 3 Scientists UH3 University of Houston. 3 Scientists WHOI Woods Hole Oceanographic Institution 3 Scientists ANS American Nuclear Society 2 Scientists Argonne Argonne National Laboratory