Who Are the Marcuses? reconstructs the lives of Holocaust refugees Lottie and Howard Marcus, an unassuming couple from Great Neck, New York, who retired to a modest two-bedroom apartment in San Diego, California. Former dentist, Howard, passed away in 2014 at age 104. Lottie passed less than two years later. In 2016, Ben-Gurion University of the Negev announced the Marcuses had given them over half a billion dollars: the largest single charitable donation to the State of Israel in its history. The film simultaneously traces the development of Israel’s vital water technology from pre-technology to the present; how the Marcuses' endowment to BGU has ensured its continued leading-edge development in this science for not only the Israeli people, but the world as a whole; sets the family’s gift in geopolitical context; and explores both its impact and implications for peace through technology exchange.