The President of the United States is the one who appoints the Supreme Court justices. Donald Trump recently appointed one. Anthony Kennedy has been there the longest and was appointed by President Reagan. There are 9 current Supreme Court Justices, all appointed at different times by different presidents:
Anthony Kennedy - Ronald Reagan
David Souter - George H W Bush
Clarence Thomas - George H W Bush
Ruth Bader Ginsburg - Bill Clinton
Stephen Breyer - Bill Clinton
John Roberts - George W Bush
Samuel Alito - George W Bush
Sonia Sotomayor - Barack Obama
Elena Kagan - Barack Obama
Neil Gorsuch - Donald Trump
