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Julián Castro (/ˌhuːliˈɑːn/ HOO-lee-AHN, Spanish: [xuˈljan]; born September 16, 1974) is an American Democratic politician who served as the 16th United States Secretary of Housing and Urban Development under President Barack Obama from 2014 to 2017, the youngest member of the Obama Cabinet.
Castro served as the mayor of his native San Antonio, Texas from 2009 until he joined Obama's cabinet in 2014. He was mentioned as a possible running mate for Hillary Clinton during the 2016 presidential campaign. Castro is the twin brother of Congressman Joaquin Castro. (source)