Who is the current Chief Justice of the United States?

The correct answer is John Roberts, who has served as the Chief Justice of the United States since September 29, 2005. As Chief Justice, he presides over the Supreme Court, leading its deliberations and influencing its decisions, particularly in cases that involve significant legal questions and constitutional interpretations.

John Roberts plays a crucial role in shaping the direction of the Court and has been involved in high-profile cases that address critical issues such as healthcare, voting rights, and administrative powers. His position also involves administrative responsibilities and managing the Court's operations, making him a central figure in the American legal system.

The other individuals mentioned held significant roles in the Supreme Court but are not the current Chief Justice. Ruth Bader Ginsburg served as an associate justice until her passing in September 2020 and was known for her strong advocacy for gender equality and civil rights. Anthony Kennedy was an associate justice known for being a swing vote on many critical decisions before his retirement in 2018. Clarence Thomas is currently an associate justice, but he has never held the title of Chief Justice.