Yaakov Bar-or (Hebrew: יעקב בר-אור) was born as Jacob Breuer to Jenny and Isaac Breuer in 1915. He studied law in Germany and became a successful attorney. Later he moved to Israel and assumed the surname "Bar-Or". He dropped the name change later in life. In 2008 he died in Jerusalem at the age of 92.
Breuer came to Israel in the 1930s and became a lawyer in 1943. In 1959 he was appointed District Attorney General in Tel Aviv. That same year he was appointed Israeli delegate to the United Nations and sat on the committee for human rights. In 1961 Breuer was assistant prosecutor in the trial of Adolf Eichman. This was the only execution and execution trial in the history of the state of Israel.