There are, of course, nine Justices of the Supreme Court of the United States. The one who was most recently appointed is Elena Kagan. Kagan has been a member of the Supreme Court since August of 2010.
Kagan was unlike most Supreme Court justices in that she had no previous judicial experience when she was appointed to the Court by Pres. Obama. Kagan did serve as a clerk for judges of both the Supreme Court and a federal Court of Appeals. However, after that, she became a legal scholar and professor. She worked in government as a lawyer and later an advisor in the Clinton White House and then as Solicitor General for Pres. Obama.
Kagan was born in 1960 and is the Court's 4th female justice and 8th Jewish justice.