Question: Ted Leadbitter's successor is president of what international think tank?

full_context: Document 1: Tony Blair: Anthony Charles Lynton Blair (born 6 May 1953) is a British politician who served as Prime Minister of the United Kingdom from 2 May 1997 to 27 June 2007 and Leader of the Labour Party from 21 July 1994 to 24 June 2007. He previously served as Leader of the Opposition from 21 July 1994 to 2 May 1997. He is the most recent British Labour Party leader to have won a general election.
Document 2: Peter Luff (campaigner): Peter John Roussel Luff, Director Mass1, Trustee, Mass Extinction Monitoringl Observatory (MEMO), Vice Chair, World Federalist Movement - Institute for Global Policy, Trustee, China Dialogue, formerly CEO Action for a Global Climate Community (2003-2011) Director of the Royal Commonwealth Society (1997–2001); formerly Director and Vice Chair of The European Movement UK, The International European Movement (1986–1995) Funding and Marketing Director of the Social Democratic Party (1981–1987) and Assistant Director of Amnesty International UK (1974–1978)
Document 3: Hilary Benn: Hilary James Wedgwood Benn (born 26 November 1953) is a British Labour Party politician who has been the Member of Parliament (MP) for Leeds Central since the by-election in 1999. He served in the cabinet from 2003–10, under the premierships of both Tony Blair and Gordon Brown. From 2010–16, he served in various Labour Party shadow cabinets, most recently as Shadow Foreign Secretary from May 2015 until June 2016, when he was dismissed by Labour leader Jeremy Corbyn. In October 2016, he was elected as the Chair of the new Exiting the European Union Select Committee.
Document 4: David Miliband: David Wright Miliband (born 15 July 1965) is a British Labour Party politician, charity chief executive and public policy analyst who was the Secretary of State for Foreign and Commonwealth Affairs from 2007 to 2010 and the Member of Parliament (MP) for South Shields from 2001 to 2013. He and his brother, Ed Miliband, were the first siblings to sit in the Cabinet simultaneously since Edward, Lord Stanley, and Oliver Stanley in 1938.
Document 5: Tony Podesta: Anthony T. Podesta (born October 24, 1943), commonly known as Tony Podesta, is an American lobbyist best known for founding the Podesta Group. Podesta has lobbied for a variety of groups, including Bank of America, BP, and Egypt in addition to political campaigns such as Ted Kennedy, George McGovern, Michael Dukakis, and Bill Clinton. More recently, he has worked for Pennsylvania Democratic representatives Joe Sestak, Chris Carney, and Patrick Murphy, and chaired former Pennsylvania Gov. Ed Rendell's reelection campaign. He is closely connected with the Barack Obama White House and has repeatedly been named one of Washington's most powerful lobbyists and fundraisers.
Document 6: Peter Mandelson: Peter Benjamin Mandelson, Baron Mandelson {'1': ", '2': ", '3': ", '4': "} (born 21 October 1953) is a British Labour politician, president of international think tank Policy Network and Chairman of strategic advisory firm Global Counsel.
Document 7: Ken Mehlman: Kenneth Brian Mehlman (born August 21, 1966) is an American businessman, attorney, and political figure. He serves as a Member and Global Head of Public Affairs at global investment firm Kohlberg Kravis Roberts, and oversees the firm’s responsible investment efforts, leading the firm’s Environmental Social Governance programs. Prior to joining KKR, Mehlman spent a year as an attorney and partner at law firm Akin Gump Strauss Hauer & Feld.
Document 8: Ted Leadbitter: Edward Leadbitter (18 June 1919 – 23 December 1996) was a British Labour politician. Leadbitter was a teacher, and served as a councillor on West Hartlepool Borough Council. Leadbitter was Member of Parliament for Hartlepool from February 1964, until he retired in March 1992. His successor was Peter Mandelson.
Document 9: Peter Hain: Peter Gerald Hain, Baron Hain, PC (born 16 February 1950) is a British Labour Party politician, who was the Member of Parliament (MP) for Neath between 1991 and 2015, and served in the Cabinets of both Tony Blair and Gordon Brown. He was the Leader of the House of Commons from 2003 to 2005 and Secretary of State for Northern Ireland from 2005 to 2007 under Blair, and as Secretary of State for Work and Pensions and Secretary of State for Wales from 2007 to 2008 under Brown. In 2007, he ran for the Deputy Leadership of the Labour Party, coming fifth out of six candidates, although his failure to declare donations during this contest led to his resignation in 2008. He later returned to the Cabinet from 2009 to 2010 as Welsh Secretary, before becoming Shadow Welsh Secretary in Ed Miliband's Shadow Cabinet from 2010 until 2012, when he announced his retirement from front-line politics. In 2014 he announced he would stand down as the MP for Neath at the 2015 general election. He was nominated for a life peerage in the 2015 Dissolution Honours. Writing in the "Guardian", he subsequently outlined his views on House of Lords reform. He came to the UK from South Africa as a teenager, and was a noted anti-apartheid campaigner in the 1970s. He was also Honorary Vice-President of the Campaign for Homosexual Equality. Peter Hain is on the board of African Potash, a company with a focus on building a vertically integrated platform for the mining, production and distribution of fertiliser.
Document 10: Andy Burnham Labour Party leadership campaign, 2015: Andy Burnham Labour Party leadership campaign, 2015
Document 11: Philip Gould, Baron Gould of Brookwood: Philip Gould, Baron Gould of Brookwood (30 March 1950 – 6 November 2011) was a British political consultant, and former advertising executive, closely linked to the Labour Party.
Document 12: Ed Miliband: Edward Samuel Miliband (born 24 December 1969) is a British politician who was Leader of the Labour Party as well as Leader of the Opposition between 2010 and 2015. He became the Member of Parliament (MP) for Doncaster North in 2005, being re-elected in 2010, 2015, and 2017, and served in the Cabinet from 2007-10 under Prime Minister Gordon Brown.
Document 13: Ben Scott (policy advisor): Ben Scott is a Senior Advisor to the Open Technology Institute at the New America Foundation in Washington, D.C. and a Visiting Fellow at the Stiftung Neue Verantwortung in Berlin. Previously, he was a Policy Advisor for Innovation at the US Department of State where he worked at the intersection of technology and foreign policy. In a small team of advisors to Secretary of State Hillary Clinton, he worked to help steward the 21st Century Statecraft agenda with a focus on technology policy, social media and development. Prior to joining the State Department, for six years he led the Washington office for Free Press, a non-profit organization dealing exclusively with media and communications policy. As policy director for Free Press, he headed a team of lawyers, researchers, and advocates, and directed a public interest policy agenda to expand affordable access to an open Internet and to foster more public service journalism. He was frequently called as an expert witness before the U.S. Congress. Before joining Free Press, he worked as a legislative aide handling telecommunications policy for then-Rep. Bernie Sanders (I-Vt.) in the U.S. House of Representatives. He holds a PhD in communications from the University of Illinois. Ben is a 1995 graduate of the University of Illinois Laboratory High School. He is the author of several scholarly articles on American journalism history and the politics of media regulation as well as co-editor of two books.
Document 14: Peter Shore: Peter David Shore, Baron Shore of Stepney, PC (20 May 1924 – 24 September 2001) was a British Labour politician and former Cabinet Minister, noted in part for his opposition to the United Kingdom's entry into the European Economic Community. His idiosyncratic left-wing nationalism led to comparison with the French politician Jean-Pierre Chevènement. He was described in an obituary by the Conservative journalist Patrick Cosgrave as "Between Harold Wilson and Tony Blair, the only possible Labour Party leader of whom a Conservative leader had cause to walk in fear" and, along with Enoch Powell, "the most captivating rhetorician of the age".
Document 15: George Thomas, 1st Viscount Tonypandy: Thomas George Thomas, 1st Viscount Tonypandy, PC (29 January 1909 – 22 September 1997) was a British Labour Party politician and Speaker of the House of Commons. Born in Port Talbot, Wales, he initially worked as a teacher in both London and Cardiff. An MP from 1945 to 1983, he held office in Harold Wilson's 1964–1970 Labour administration, notably as Secretary of State for Wales from 1968 to 1970. As a junior minister at the Wales Office, he was one of the first on the scene of the Aberfan disaster 21 October 1966, although later involved in the controversial government decision to use money from the Aberfan Charity Fund to clear remaining National Coal Board waste tips from around the village. In 1976 Thomas was elected Speaker of the House of Commons, in which role the first broadcasting of parliamentary proceedings brought him unprecedented public attention. He retired from parliament in 1983 and was elevated to the peerage as Viscount Tonypandy, of Rhondda in the County of Mid Glamorgan.
ground_truth: Policy Network