Who is the current Chief Justice of the United States?

The current Chief Justice of the United States is John Roberts. He was appointed to the position by President George W. Bush and took his oath of office in September 2005. As Chief Justice, Roberts leads the Supreme Court and has significant influence over its agenda, managing court proceedings and often playing a key role in shaping judicial opinion. His tenure has included pivotal cases on issues such as health care, campaign finance, and rights related to equality and privacy.

The other individuals mentioned in the choices were prominent justices but are not currently serving as Chief Justice. Ruth Bader Ginsburg, for example, served as an Associate Justice until her passing in September 2020, while William Rehnquist served as Chief Justice from 1986 until his death in 2005. Clarence Thomas is a current Associate Justice but does not hold the position of Chief Justice. This context reinforces John Roberts' ongoing role as the leader of the United States Supreme Court.