Question: Charles Douglas "Cully" Stimson joined an American conservative think tank based in what location?

Context paragraphs:
Claremont Institute: The Claremont Institute is an American conservative think tank based in Claremont, California.  The institute was founded in 1979 by four students of Harry V. Jaffa and came to prominence under the leadership of Larry P. Arnn, who was its president from 1985 until 2000.  The Institute publishes the "Claremont Review of Books", a quarterly journal of political thought and statesmanship, as well as other books and publications.

Charles Stimson: Charles Douglas "Cully" Stimson (born June 13, 1963) is an American lawyer and government official.  Stimson served as the Deputy Assistant Secretary of Defense for Detainee Affairs from 2005 until his resignation on February 2, 2007, following a controversy about his statements on legal representation for prisoners at Guantánamo Bay.  Following his time in the George W. Bush administration, Stimson joined The Heritage Foundation, where he is currently a senior legal fellow and manager of the National Security Law Program.  Earlier in his career, Stimson served as an Assistant United States Attorney for the District of Columbia and as Vice President for Private Equity Mergers & Acquisitions at Marsh & McLennan Companies.

IMANI Centre for Policy and Education: The '"IMANI Center for Policy and Education"' is an African think tank based in Accra, Ghana.  As a member of the Atlas Economic Research Foundation, the think tank applies free market solutions to intricate domestic social problems.  It was founded in 2004 by Franklin Cudjoe, who currently serves as the president and chief executive officer.  The think tank's operations center on these four thematic areas: rule of law, market growth and development, individual rights, and human security and institutional development.  IMANI uses the Africanliberty.org platform as a springboard to reach out to the larger African audience in five international languages, including Swahili.IMANI exerts influence in the Ghanaian public education and policy sphere through media appearances, publications, research, and seminars.  The think tank is ranked by the Global Go To Think Tanks and Civil Societies Program, organized annually by the University of Pennsylvania.  According to the 2009 Index Report, IMANI was ranked fifth most influential in Sub-Saharan Africa, and the only African think tank to make the list of top 25 "Most Innovative" across the world.

Caleb Crosby: Caleb Crosby is an American think tank executive.  In 2014, he became president of the Alabama Policy Institute (API), a conservative think tank based in Birmingham, Alabama.  Crosby had previously served as API's vice president and chief financial officer.  Prior to joining the think tank, Crosby worked for the 2004 re-election campaign of George W. Bush.  He served in the George W. Bush administration at the Environmental Protection Agency and later at the White House, where he traveled with President Bush as a financial advisor.  Crosby also worked at the United States Department of the Treasury and as CFO of the National Republican Congressional Committee.

Pravý Břeh: Pravý Břeh (in English: Right bank ) is a conservative think tank based in the Czech Republic.  It is a formed by a group of intellectuals with an objective to think, propose and implement reforms that are in par with the ideals of the right wing thinkers.  The name "right bank" is coined taking into consideration the objectives of "right wing", that are in contrast with the objectives of the "left wing."  It produces an eponymous online newspaper.

Brian Lee Crowley: Brian Lee Crowley, a native of Vancouver, British Columbia, Canada, is Managing Director of the Macdonald-Laurier Institute, a national public policy think tank based in Ottawa, Ontario, Canada.  He was also the founding President of the Atlantic Institute for Market Studies (AIMS), a public policy think tank based in Atlantic Canada.  He authored of three books ("The Self, the Individual and the Community", Oxford University Press, 1987; "The Road to Equity: Impolitic Essays", Stoddart, 1994; and "Fearful Symmetry: The Fall and Rise of Canada’s Founding Values", Key Porter Books, 2009).  He was the editor of "Taking Ownership: Property Rights and Fishery Management on the Atlantic Coast", AIMS, 1996.

Texas Public Policy Foundation: The Texas Public Policy Foundation (TPPF) is a conservative think tank based in Austin, Texas.  It is a member of the State Policy Network, a network of free-market oriented think tanks.  The stated mission of TPPF is "to promote and defend liberty, personal responsibility, and free enterprise in Texas and the nation by educating and affecting policymakers and the Texas public policy debate with academically sound research and outreach."  TPPF notes that its guiding principles are "individual liberty, personal responsibility, private property rights, free markets and limited government".

Information Technology and Innovation Foundation: The Information Technology and Innovation Foundation (ITIF) is a U.S. nonprofit public policy think tank based out of Washington, D.C. The organization focuses on public policies that spur technology innovation.  The University of Pennsylvania rates ITIF the most authoritative science and technology think tank in the United States, and the second most authoritative science and technology think tank in the world, behind Germany's Max Planck Institutes.  Ars Technica has described ITIF as "one of the leading, and most prolific, tech policy think tanks."

Wang Huiyao: Dr.Wang, Huiyao (Henry) (; born July 2, 1958) is the Founder and President of Center for China and Globalization (CCG),the largest independent global think tank in China which has over 100 full-time researchers and working staff.  According to the "2016 Global Go To Think Tank Index" by the University of Pennsylvania Think Tank and Civil Society Program (TTCSP), the most prestigious think tank ranking in the world, CCG ranked 111th of the top world think tanks and was one of the world's top 40 independent think tanks.  TTCSP ranked CCG as the 7th top think tank in China and No. 1 independent think tank among the top Chinese think tanks.  Dr. Wang is also a top adviser to the Chinese government.  He was appointed as Counselor for China State Council by the Chinese Premier in 2015.  Dr. Wang is a well-known thought leader on China and globalization, China going global, Chinese global migration and talent flows, Chinese students studying abroad and returnees, and on global think tanks.  He is also a top adviser to international organizations such as World Bank, IOM and ILO as well as to global MNCs.  Dr. Wang has an impressive work career span over both Chinese and foreign governments, multinational executive, social entrepreneurial and academic fields.

The Heritage Foundation: The Heritage Foundation (abbreviated to Heritage) is an American conservative think tank based in Washington, D.C. The foundation took a leading role in the conservative movement during the presidency of Ronald Reagan, whose policies were taken from Heritage's policy study "Mandate for Leadership".  Heritage has since continued to have a significant influence in U.S. public policy making, and is considered to be one of the most influential conservative research organizations in the United States.  After the 2016 election of Donald Trump as U.S. President, Heritage leader Rebekah Mercer played a major role in shaping his transition team.

Supporting paragraphs: Charles Stimson The Heritage Foundation
Answer: Washington, D.C.