Ketanji Brown Jackson has been sworn in as a Supreme Court justice, making her the first black woman on the highest court in the United States.

Jackson, a former public defender and federal appeals court judge, was sworn in during a small ceremony shortly after Justice Stephen Breyer’s retirement became official.

Chief Justice John Roberts administered the constitutional oath and Justice Breyer administered the judicial oath.

Chief Justice Roberts said a formal investiture ceremony will be held for Jackson in the fall, but her swearing-in today enables her to start working in the court in the meantime.

Jackson’s nomination was confirmed by the Senate in a 53 to 47 vote in April.

Vice President Kamala Harris, the first Black American and first person of South Asian descent to be elected to her role, presided over the vote.