Question: Which cofounder of the Center for a New American Security served as a principal advisor to U.S. Secretaries of Defense Robert Gates and Leon Panetta?

full_context: Document 1: Leon Panetta: Leon Edward Panetta (born June 28, 1938) is an American politician who has served in several different public office positions, such as Secretary of Defense, Director of the CIA, White House Chief of Staff, Director of the Office of Management and Budget, and as a U.S. Representative from California. A Democrat, Panetta was a member of the United States House of Representatives from 1977 to 1993, served as Director of the Office of Management and Budget from 1993 to 1994, and as President Bill Clinton's Chief of Staff from 1994 to 1997. He co-founded the Panetta Institute for Public Policy and served as a Distinguished Scholar to Chancellor Charles B. Reed of the California State University System and as a professor of public policy at Santa Clara University.
Document 2: Minister for Defence (Australia): The Australian Minister for Defence is currently Senator the Honourable Marise Payne. Senator Payne became the first female Minister for Defence on 21 September 2015.
Document 3: McCain Institute: The McCain Institute for International Leadership is a Washington, D.C.-based think tank in cooperation with Arizona State University whose mission is to "advance leadership based on security, economic opportunity, freedom, and human dignity, in the United States and around the world." The institute was formed in 2012 and is named after U.S. Senator and 2008 Republican Party presidential nominee John McCain from Arizona. Based in Washington, D.C., the McCain Institute is part of Arizona State University. The current executive director of the McCain Institute is Kurt Volker.
Document 4: Derek Chollet: Derek Chollet is Executive Vice President for security and defense policy at the German Marshall Fund of the United States, and author of the book, "The Long Game: How Obama Defied Washington and Redefined America's Role in the World " (Public Affairs, 2016). He is a contributing editor to Foreign Policy, where he coedits "Shadow Government," and is a regular contributor to Defense One, is also an advisor to Beacon Global Strategies and an Adjunct Senior Research Scholar at Columbia University’s Saltzman Institute of War and Peace Studies. From 2012-2015, Mr. Chollet was the U.S. Assistant Secretary of Defense for International Security Affairs, where he managed U.S. defense policy toward Europe (including NATO), the Middle East, Africa, and the Western Hemisphere. In that role, he was a senior advisor to two secretaries of defense, Leon Panetta (July 2011 until February 2013) and Chuck Hagel (until February 2015).
Document 5: The Asia Group: The Asia Group LLC (TAG) is a strategy and capital advisory group based in Washington DC with an affiliated office in Hong Kong. The firm was founded in 2013 by Dr. Kurt Campbell, the former Assistant Secretary of State for East Asian and Pacific Affairs and Nirav Patel, former Deputy Assistant Secretary of State for Strategy and Multilateral Affairs. The company works with clients to identify, integrate and advance new business opportunities, as well as work with existing businesses to navigate the complexities of both established and emerging markets in Asia. The Asia Group is not a lobbying organization.
Document 6: Partnership for a Secure America: Partnership for a Secure America (PSA) is a nonprofit organization in Washington, D.C. that seeks to promote bipartisan solutions to today's critical national security and foreign policy issues. Created by former Congressman Lee H. Hamilton and former Senator Warren Rudman (R-NH) in 2005, the Partnership for a Secure America works with leading Democrats and Republicans to rebuild the bipartisan center in American national security and foreign policy.
Document 7: Mark Krikorian: Mark Krikorian has been the executive director of the Center for Immigration Studies, a think-tank in Washington, D. C., since 1995. The Center describes itself as an "independent, non-partisan research organization" in Washington, D. C., that examines and critiques the impact of immigration on the United States. Animated by a "pro-immigrant, low-immigration vision which seeks fewer immigrants, but a warmer welcome for those admitted", the Center was established in 1985 to provide immigration research. Krikorian is a regular contributor to the conservative publication "National Review", and is a regular participant at "National Review Online's" "The Corner."
Document 8: Elissa Slotkin: Elissa Slotkin is the former Acting Assistant Secretary of Defense for International Security Affairs under the Obama Administration. She was the principal advisor to the Under Secretary of Defense and Secretary of Defense on security strategy and policy issues related to the nations and international organizations of Europe (including the North Atlantic Treaty Organization), Russia, the Middle East, Africa, and the Western Hemisphere. She also had oversight for security cooperation programs, including foreign military sales in these regions. Previously, from September 2012 to January 2015, Elissa served as Principal Deputy Assistant Secretary of Defense for International Security Affairs. From July 2013 to August 2014, she performed the duties of Principal Deputy Under Secretary of Defense for Policy.
Document 9: Center for a New American Security: The Center for a New American Security (CNAS) is a Washington, D.C.-based think tank established in 2007 by co-founders Michèle Flournoy and Kurt M. Campbell. It specializes in the United States' national security issues. CNAS's stated mission is to "develop strong, pragmatic and principled national security and defense policies that promote and protect American interests and values." CNAS focuses on terrorism and irregular warfare, the future of the U.S. military, the emergence of Asia as a global power center, and the national security implications of natural resource consumption. Former Deputy Secretary of State James Steinberg called CNAS "an indispensable feature on the Washington landscape." Speaking at the CNAS annual conference in June 2009, U.S. Central Command Commander GEN David Petraeus observed that "CNAS has, in a few years, established itself as a true force in think tank and policy-making circles."
Document 10: James M. Lindsay: James M. Lindsay (born November 29, 1959, Winchester, Massachusetts), is the Senior Vice President, Director of Studies, and Maurice R. Greenberg Chair at the Council on Foreign Relations (CFR) and a leading authority on U.S. foreign policy. He is also the award-winning coauthor of "America Unbound: The Bush Revolution in Foreign Policy" and former Director for Global Issues and Multilateral Affairs at the National Security Council. In 2008, he was the principal author of a Department of Defense funded $7.6 million Minerva Research Initiative grant entitled "Climate Change, State Stability, and Political Risk in Africa." He is the author of a CFR blog on American foreign policy, The Water's Edge.
Document 11: Michele S. Jones: Michele S. Jones was the first woman in the United States Army Reserve to reach the position of command sergeant major of the U.S. Army Reserve. She was the first female non-commissioned officer to serve in the highest enlisted position of a component of the U.S. Army, active or reserve, and was at one time the highest-ranking African-American female enlisted person in any branch of the United States military, as well as the highest-ranking enlisted African American in the Army Reserve.
Document 12: Avril Haines: Avril Danica Haines (born August 29, 1969) was the first female White House Deputy National Security Advisor, serving in Barack Obama's administration. She previously served as Deputy Director of the Central Intelligence Agency, the first woman to hold this position. Prior to her appointment to the CIA, she served as Deputy Counsel to the President for National Security Affairs in the Office of White House Counsel.
Document 13: Michael Flynn: Michael Thomas "Mike" Flynn (born December 1958) is a retired United States Army Lieutenant General, who served in the Army for 33 years until 2014. Flynn's military career included a key role in shaping U.S. counterterrorism strategy and dismantling insurgent networks in Afghanistan and Iraq, and he was given numerous combat arms, conventional, and special operations senior intelligence assignments. He was appointed by President Barack Obama as the eighteenth director of the Defense Intelligence Agency, serving from July 2012 to his retirement from the military in August 2014. After leaving the military, he established Flynn Intel Group which has provided intelligence services for businesses and governments, including ones in Turkey. Flynn also briefly served as the twenty-fifth National Security Advisor for President Donald Trump, from January 20 to February 13, 2017.
Document 14: Robin Fontes: Robin L. Fontes is a United States Army major general. In July 2017 she took command of Combined Security Transition Command – Afghanistan, becoming the highest-ranking female military officer in Afghanistan since the American invasion of that country in 2001. A mustang officer, Fontes was commissioned in 1986 and focused on Central Asia, eventually serving in Tajikistan, Pakistan, and India, including a few years in Afghanistan. She assumed her current position after the resignation of Michael Flynn from the Trump Administration ended her announced role as senior director for India, Pakistan and Central Asian Affairs on the United States National Security Council.
Document 15: Michèle Flournoy: Michèle Angelique Flournoy (born December 14, 1960) is the former Under Secretary of Defense for Policy, the seventh-ranking official in the U.S. Department of Defense, and in that role served as a principal advisor to U.S. Secretaries of Defense Robert Gates and Leon Panetta from February 2009 to February 2012. When the U.S. Senate confirmed her nomination on February 9, 2009, she was at the time the highest-ranking woman at the Pentagon in the department's history.
ground_truth: Michèle Flournoy