<Tr> <Td> </Td> <Td> None </Td> </Tr> <Tr> <Th> 109 </Th> <Td> </Td> <Td> Bill de Blasio (born in 1961; aged 57) </Td> <Td> January 1, 2014--Incumbent </Td> <Td> 4 years </Td> <Td> </Td> <Td> Democratic </Td> <Td> 3rd New York City Public Advocate (2010--2013) </Td> </Tr> <Ol> <Li> Randolph Gugghenheimer I (born 1846) served as acting mayor in 1900 while Robert A. Van Wyck was away . </Li> <Li> Seth Low previously served as Mayor of the City of Brooklyn from 1882 to 1885 . </Li> <Li> William Jay Gaynor died September 10, 1913 . Ardolph L. Kline, the unelected President of the Board of Aldermen, succeeded as acting mayor upon Gaynor's death, but then sought re-election as an alderman (successfully) rather than election as mayor . Kline has thus been the only mayor since 1834 never to win a citywide election (having been appointed Vice President of the Board of Aldermen by his colleagues and then succeeding to the presidency mid-term, rather than winning it by popular election at large). </Li> <Li> John Hylan and Police Commissioner Richard Enright resigned December 30, 1925 to ensure that they received their city pensions, which they may not have been entitled to keep had they stayed in office for one more day . William T. Collins became acting Mayor for one day, prior to the inauguration of Jimmy Walker </Li> <Li> Jimmy Walker resigned September 1, 1932 and went to Europe, amid allegations of corruption in his administration . Joseph V. McKee, as President of the Board of Aldermen, became acting mayor in Walker's place, but was then defeated in a special election by John P. O'Brien . </Li> <Li> William O'Dwyer resigned August 31, 1950, during a police corruption scandal, after which he was appointed Ambassador to Mexico by President Harry S. Truman . </Li> <Li> Vincent R. Impellitteri, President of the New York City Council, became acting mayor when O'Dwyer resigned on August 31, 1950, and was then elected to the office in a special election held on November 7, 1950 . He was inaugurated on November 14 . </Li> <Li> Michael R. Bloomberg was a Democrat before running for mayor . </Li> </Ol> <Li> Randolph Gugghenheimer I (born 1846) served as acting mayor in 1900 while Robert A. Van Wyck was away . </Li>

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