President-elect Joe Biden’s pick to lead the Department of Homeland Security, Alejandro Mayorkas, is best known for overseeing the implementation of Deferred Action for Childhood Arrivals during his time in the Obama administration.

Mayorkas, 61, was described by a former DHS official as a “centrist,” but compared to the Trump White House’s immigration policies, Mayorkas’s strategies have sided with immigrants of various backgrounds, while President Trump’s policies have clenched down against many forms of legal and illegal immigration.