President Joe Biden is expected to pick Ketanji Brown Jackson for the U.S. Supreme Court, where she would become the first Black female justice if confirmed, but would add to the current bench’s diversity of experience as its first former public defender and its second former federal trial judge.

Jackson, 51, who sits on the U.S. Court of Appeals for the D.C. Circuit, is expected to be Biden’s choice to fill the vacancy that will follow Justice Stephen Breyer’s retirement at the end of the court’s term in late June or early July, according to sources close to the process. Jackson clerked for Breyer in the 1999-2000 term.