The Cato Institute is an American libertarian think tank headquartered in Washington, D.C. It was founded as the Charles Koch Foundation in 1974 by Ed Crane, Murray Rothbard, and Charles Koch, chairman of the board and chief executive officer of the conglomerate Koch Industries.
 In July 1976, the name was changed to the Cato Institute.
Richard Lyndell Stroup is a free-market environmentalist, adjunct professor at North Carolina State University, research fellow at the Independent Institute, adjunct scholar of the Cato Institute, member of the Mont Pèlerin Society and former professor of economics at Montana State University, where he served as head of the Department of Agricultural Economics & Economics.
 He also served as director of the Office of Policy Analysis in the U.S. Department of the Interior.
 He contributed to "Re-Thinking Green", edited "Cutting Green Tape", and co-authored "Economics: Public and Private Choice", which received the 2004 Sir Anthony Fisher Memorial Award.
 He is married to Jane Shaw, former President of the John W. Pope Center for Higher Education Policy.
Arnold Kling (born 1954) is an American economist, scholar, and blogger known for his writings on EconLog, an economics blog, along with Bryan Caplan and David R. Henderson.
 Kling now has his own blog, askblog which sports the motto: "taking the most charitable views of those who disagree."
 The "ask" in askblog apparently stands for "Arnold S. Kling."
 He is an Adjunct Scholar for the Cato Institute and is affiliated with the Mercatus Center.
Abigail Thernstrom (born 1936) is an American political scientist and a leading conservative scholar on race relations.
 She is currently an adjunct scholar at the American Enterprise Institute.
 She was formerly Senior Fellow at the Manhattan Institute, a member of the Massachusetts Board of Education, and vice chair of the United States Commission on Civil Rights under George W. Bush.
 She received her Ph.D. from the Department of Government at Harvard University in 1975.
Robert "Bob" Corn-Revere is an American First Amendment attorney.
 Corn-Revere is currently a partner at Davis Wright Tremaine LLP in Washington, D.C. and an adjunct scholar at the Cato Institute.
 Corn-Revere was named as one of "America's Leading Lawyers for Business" in Media & Entertainment by Chambers USA, 2005–2014 and “Washington, D.C. Super Lawyers,” Top in First Amendment/Media/Advertising, Law & Politics, 2008-2014 and in Communications 2011-2014, “Best Lawyers in America” in Communications, Entertainment, First Amendment, and Media Law, 2010-2014, and has been listed by Washingtonian Magazine as one of “Washington’s Top Lawyers” in Communications Law and First Amendment Law.
Dr Patrick Basham is an adjunct scholar with the Cato Institute, and the founding Director (in 2006) of the Democracy Institute.
 Basham was previously the founding director of the Social Affairs Centre at the Canadian Fraser Institute, and formerly Senior Fellow at the Cato Institute.
 He has published a number of books and contributed articles to a range of major US newspapers.
Bryan Douglas Caplan (born April 8, 1971) is an American economist.
 Caplan is a professor of economics at George Mason University, research fellow at the Mercatus Center, adjunct scholar at the Cato Institute, and frequent contributor to Freakonomics as well as publishing his own blog, EconLog.
 He is a self-publicized economic libertarian.
 The bulk of Caplan's academic work is in public economics, especially public choice theory.
James Nicholas Tooley (born July 1959, in Southampton, England) is a professor of education policy at the University of Newcastle upon Tyne, where he directs the E. G. West Centre.
 For his research on private education for the poor in India, China and Africa, Tooley was awarded the gold prize in the first International Finance Corporation/Financial Times Private Sector Development Competition in September 2006.
 From 2007 to 2009, he was founding President of the Education Fund, Orient Global, and lived in Hyderabad, India.
 He is currently chairman of education companies in Ghana (Omega Schools Franchise Ltd) and India (Empathy Learning Systems Pvt Ltd) creating low cost chains of low cost private schools.
 He also holds an appointment as an Adjunct Scholar at the Cato Institute and serves on the Advisory Council of the Institute of Economic Affairs as well as on the Academic Advisory Council of Civitas: The Institute for the Study of Civil Society.
 He also serves on the Board of Visitors of Ralston College, a start-up liberal arts college in Savannah.
Kevin Corke is an American journalist and is, presently, a White House Correspondent for Fox News Channel in Washington D.C. Corke was a national news correspondent based in Washington D.C. for NBC from 2004-2008.
 Most of his work there involved coverage of the Bush Administration as a member of the White House Press Corps.
 Additionally, Corke frequently reported from The Pentagon, U.S. Supreme Court and other locations in Washington D.C. Corke also figured prominently in NBC's coverage of the Virginia Tech shooting.
Robert L. Bradley Jr. (born June 17, 1955) is CEO and founder of the Institute for Energy Research, and the author of several books on energy economics.
 He is also an adjunct scholar of the Cato Institute and the Competitive Enterprise Institute in Washington, D.C. and a visiting fellow of the Institute of Economic Affairs in London.

Question: What institute in Washington D.C. is Bryan Douglas Caplan an adjunct scholar for?
Answer: Cato Institute