Brock Daniel Bierman is an American humanitarian and public official who served as Assistant Administrator of the United States Agency for International Development's (USAID) Bureau for Europe and Eurasia under president Donald Trump from December 21, 2017[1] until 2021.

In the aftermath of Hurricane Katrina, in 2007 Bierman was appointed by George W. Bush[9] as the nation's first Small State and Rural Advocate at the Federal Emergency Management Agency.

Bierman was also named director of Citizen Corps, a program under the Department of Homeland Security which oversaw community preparedness for the United States, and the nation's largest network of volunteers for natural and manmade disasters.

In October 2017, Bierman was nominated by Donald Trump to serve as USAID's Assistant Administrator for Europe and Eurasia and his appointment was confirmed by the United States Senate by unanimous voice vote in December of that year.

[15] Prior to the hiring freeze and subsequent dispute, The Washington Post had reported that the White House had been rewarding Trump supporters with jobs within the MCC, with the previous acting CEO Robert Blau resigning amid controversy over the political nature of those placements.

In May 2022, Bierman was named president and CEO of Worldwide Friends Foundation, a New York-based 501(c)(3) humanitarian organization, to immediately administer the organization's current mission, UkraineFriends.org which had been operating buses daily to evacuate nearly 30,000 Ukrainian women, children and seniors from Lviv, Ukraine to Przemysl, Poland, and through a partnership with Airbnb offering vouchers to temporarily house 14,000 evacuees, and to support needs related to mental health, foreign language, translation services, and reconstruction/repatriation after the war.

While in Ukraine Bierman has met with members of the Territorial Defense Forces, the Ministry of Health and local and state officials and volunteers to help assist internally displaced people (IDP's).

In January 2023, Bierman supported the Mayor of Bucha, Andrii Federuk's trip to the United States, where they visited Washington DC, New York and Pennsylvania.