Miles Taylor (security expert)

Miles Taylor is an American former government official in the Trump administration. He worked for the United States Department of Homeland Security from 2017 to 2019, including as Chief of Staff to former Homeland Security Secretary Kirstjen Nielsen and Acting Secretary Chad Wolf. 
In August 2020, while on leave from his job at Google, he produced an ad for Republican Voters Against Trump, criticizing Trump and supporting Joe Biden in the 2020 presidential election. Taylor was the first former senior Trump administration staffer to endorse Biden. 
In October 2020, he revealed himself to be the anonymous writer of the essay "I Am Part of the Resistance Inside the Trump Administration" (2018) and the best-selling book "A Warning" (2019).