Question: When was the political leader to which Einstein–Szilárd letter was written born? 

Context paragraphs:
Einstein–Szilárd letter: The Einstein–Szilárd letter written by Leó Szilárd and signed by Albert Einstein that was sent to the United States President Franklin D. Roosevelt on August 2, 1939.  Written by Szilárd in consultation with fellow Hungarian physicists Edward Teller and Eugene Wigner, the letter warned that Germany might develop atomic bombs and suggested that the United States should start its own nuclear program.  It prompted action by Roosevelt, which eventually resulted in the Manhattan Project developing the first atomic bombs.

Ahmad al-Bakkai al-Kunti: Ahmad al-Bakkai al-Kunti (1803 in the Azawad region north of Timbuktu – 1865 in Timbuktu) was a West African Islamic and political leader.  He was one of the last principal spokesmen in precolonial Western Sudan for an accommodationist stance towards the threatening Christian European presence, and even provided protection to Heinrich Barth from an attempted kidnapping by the ruler of Massina, Amadu III.  In a letter to the ruler, which was rather a "fatwa" he denied the former's right to have Barth arrested or killed and his belongings confiscated, as the Christian was neither a "dhimmi" (a non-Muslim subject of a Muslim ruler) nor an enemy of Islam, but the native of a friendly country, that is Great Britain.  He went as far as to deny Ahmad Ahmad ibn Muhammad Lobbo the right to proclaim a jihad and called him "the ruler over a few huts at the outskirts of the Islamic world".

Leo Szilard: Leo Szilard ( ; Hungarian: "Szilárd Leó" ; ] ; German: "Leo Spitz" until age 2; February 11, 1898 – May 30, 1964) was a Hungarian-born physicist and inventor.  He conceived the nuclear chain reaction in 1933, patented the idea of a nuclear reactor with Enrico Fermi in 1934, and in late 1939 wrote the letter for Albert Einstein's signature that resulted in the Manhattan Project that built the atomic bomb.

Jean-Jacques Démafouth: Jean-Jacques Démafouth (born November 3, 1959 in Bangui) is a political leader in the Central African Republic.  He is a former Defense Minister, Presidential candidate, and is the current political leader of the APRD rebel group.  He led the peace delegation of the APRD to talks with the government in December 2008.

Arthur Manuel: Arthur Manuel (1951 – January 11, 2017) was a First Nations political leader in Canada.  The son of Marceline Paul of the Ktunaxa Nation and political leader George Manuel of the Secwepemc Nation, he grew up on the Neskonlith Reserve in the interior of British Columbia.  He attended the Kamloops (Kamloops BC), St Eugene’s (Cranbrook BC) and St. Mary’s (Mission BC) residential schools, Concordia University (Montreal, Quebec) and Osgoode Hall Law School (Toronto, Ontario).  He is the father of five children.

Winston Dookeran: Winston Chandarbhan Dookeran (Hindi: विंस्टन चंद्रभान डूलेरन; born 24 June 1943) is a Trinidad and Tobago politician and economist.  He previously served as Political Leader of the Congress of the People.  His term ended on 3 July 2011 when internal elections was held to select a political leader.  At a press conference on 28 May 2011, Mr. Dookeran indicated that he will not be seeking re-election to the post.  In the 24 May 2010 election, he successfully ran for Member of Parliament for the Tunapuna constituency.

Marco Pastors: Pastors was political leader of the local party Livable Rotterdam (Leefbaar Rotterdam), a member of the city council and also an alderman of the municipality of Rotterdam.  Besides he was political leader of One NL (Een NL), a Dutch political party at the national level.

Surujrattan Rambachan: Surujrattan Rambachan is a Trinidad and Tobago politician, academic and cultural activist who s of 2013 was the Works and Infrastructure Minister of Trinidad and Tobago and deputy political leader of the United National Congress Party (UNC) and member of parliament for Tabaquite.  He previously served as mayor of Chaguanas, Senator and Minister in the Ministry of Industry and Tourism and Ambassador to Brazil.  In 1980 he was a founding member of the Organisation for National Reconstruction and served as Deputy Political Leader of that party.  He played a key role in the establishment of Indian Arrival Day as a national celebration in Trinidad and Tobago.  He is now the Minister of Foreign Affairs and Member of Parliament for the constituency of Tabaquite.

Alexander Sachs: Alexander Sachs (1 August 1893 – 23 June 1973) was a Jewish-American economist and banker.  In October 1939 he delivered the Einstein–Szilárd letter to President Franklin D. Roosevelt, suggesting that nuclear-fission research ought to be pursued, with a view to possibly constructing nuclear weapons, should they prove feasible, in view of the likelihood that Nazi Germany would do so.  This led to the initiation of the United States' Manhattan Project.

Franklin D. Roosevelt: Franklin Delano Roosevelt ( , his own pronunciation, or ; January 30, 1882 – April 12, 1945), commonly known as FDR, was an American statesman and political leader who served as the 32nd President of the United States from 1933 until his death in 1945.  A Democrat, he won a record four presidential elections and emerged as a central figure in world events during the mid-20th century.  He directed the United States government during most of the Great Depression and World War II.  As a dominant leader of his party, he built the New Deal Coalition, realigning American politics into the Fifth Party System and defining American liberalism throughout the middle third of the 20th century.  He is often rated by scholars as one of the three greatest U.S. Presidents, along with George Washington and Abraham Lincoln.

Supporting paragraphs: Einstein–Szilárd letter Franklin D. Roosevelt
Answer: January 30, 1882