Early life and education
Arenstein earned an undergraduate degree from University at Buffalo, The State University of New York and then earned a master's degree in 1974 from the Annenberg School for Communication at the University of Pennsylvania.
From 1974 until 1981, Arenstein resided in Israel, working as a reporter for The Jerusalem Post newspaper and for Israeli Radio. In 1978, Arenstein was hired by United Press International as the wire service's Jerusalem bureau chief and as an editor on UPI's foreign desk in New York and Washington.
During his time at CBS News, Arenstein has covered the impeachment process of President Clinton, the disputed United States presidential election, the September 11 attacks, the war in Iraq and the Beltway sniper attacks.
Arenstein has won two individual Edward R. Murrow awards for outstanding journalism - one in 2002 for feature reporting, and one in 2006 for covering the first home game of the Washington Nationals baseball team.
Arenstein's wife, Orly Azoulay, is the Washington, D.C. correspondent for the Israeli newspaper Yedioth Ahronoth. He has two children, Leah and Louis. On July 13, 2013, his son Louis was charged with vandalizing cars in the Washington, D.C. area.