What is Kirstjen Nielsen?
{{Infobox officeholder |name = Kirstjen Nielsen |image = Kirstjen Nielsen official photo.jpg |office = 6th [[United States Secretary of Homeland Security]] |president = [[Donald Trump]] |deputy = [[Elaine Duke]]<br>[[Claire Grady]] {{small|(Acting)}} |term_start = December 6, 2017 |term_end = April 10, 2019 |predecessor = [[John F. Kelly]] |successor = [[Alejandro Mayorkas]]<br>[[Kevin McAleenan]] {{small|(Acting; [[de facto]])}} |office1 = [[White House Deputy Chief of Staff]] |president1 = [[Donald Trump]] |term_start1 = September 6, 2017 |term_end1 = December 6, 2017 |predecessor1 = [[Katie Walsh (politician)|Katie Walsh]] |successor1 = ''Vacant'' |office2 = Chief of Staff to the [[United States Secretary of Homeland Security]] |term_start2 = January 20, 2017 |term_end2 = July 31, 2017 |president2 = [[Donald Trump]] |predecessor2 = Paul Rosen |successor2 = Chad Wolf {{small|(Acting)}} |birth_name = Kirstjen Michele Nielsen |birth_date = {{Birth date and age|1972|5|14}} |birth_place = [[Colorado Springs, Colorado]], [[United States]] |death_date = |death_place = |party =Independent |education = {{nowrap|[[Georgetown University]] {{small|([[Bachelor of Science|BS]])}}}}<br>[[University of Virginia]] {{small|([[Juris Doctor|JD]])}} }} '''Kirstjen Michele Nielsen''' (born May 14, 1972)<ref>{{Cite web|url=https://www.familysearch.org/ark:/61903/1:1:KGY4-Q1C|title=FamilySearch.org}}</ref> is an American government official and national [[security]] expert. Nielsen was the 6th [[United States Secretary of Homeland Security]] from December 6, 2017 to April 10, 2019. Before, she served as Principal [[White House Deputy Chief of Staff|Deputy White House Chief of Staff]] to [[President of the United States|President]] [[Donald Trump]] from September 6, 2017 to December 5, 2017. She has [[informally]] performed the role of Deputy Chief of Staff since [[John F. Kelly]] became [[White House Chief of Staff]] on July 31, 2017. [[Nielsen]] i