David Luzer Lowenthal (1921-09-11 – 2006-03-08), a Pittsburgh industrialist, was born in Dobramil, Poland, to Markus Lowenthal (b. 1889) and Sarah Latke Lowenthal. He immigrated to the United States in the 1930s, settling in Pittsburgh, PA, where he derived U.S. citizenship in 1939 via his father's naturalization and fully naturalized on July 27, 1955. Lowenthal served in the U.S. Armed Forces during World War II, though initially denied enlistment due to tuberculosis. A strong Zionist, he traveled as a seaman on the President Warfield (later Exodus in 1947), defending it during an attempt to bring Holocaust survivors to Palestine; he was imprisoned and beaten by British authorities before escaping to Israel. He was involved in purchasing the Pan York to transport refugees to Israel in 1947 and fought as a volunteer in the 1948 War of Independence with Haganah/security forces, where he was photographed with David Ben-Gurion and Moshe Dayan. Lowenthal served as a delegate to the World Zionist Congress in 1956, led the Pittsburgh Zionist movement, was active with the United Jewish Appeal, helped resettle Holocaust survivors in Israel, and frequently traveled to Israel, including monthly visits in the late 1960s. In his career, he acquired the Apollo Steel Company plant in Apollo, PA, in 1955 with partners and restarted operations; invested substantially in NUMEC stock through Apollo Industries (Pittsburgh) in 1957; served as president of Raychord Corporation (steel fabrication in Apollo, PA, incorporated 1962, sharing a building with NUMEC); and held roles such as VP of Columbus Pipe & Equipment Co. (OH), VP of Holder Fence & Steel Co. (WV), Secretary-Treasurer of Mount Vernon Sales Corp. (OH, inactive), and principal of Laut Parking Inc. (Pittsburgh, inactive). A long-time close personal friend of Zalman Shapiro, he was an instrumental financier in the establishment of NUMEC. Personally, he married Rita F. Lowenthal around December 1951 (later divorced) and had children including Mark Lowenthal; he resided in Pittsburgh's Oakland neighborhood, such as at 5721 Bartlett St. Lowenthal was subject to an FBI investigation from 1968-1969 due to his close ties to Zalman Shapiro, NUMEC, and suspected Israeli intelligence links—he was a key contact for Israeli Military Attaché Gen. David Carmon (an intelligence figure), provided regular reports on Israeli military activities, and received phone calls from Tel Aviv—but no subversive activities were found, and the case closed in July 1969. In the context of the NUMEC affair, he was scrutinized for his financing role and potential uranium diversion to Israel, though no charges were filed. He died of stomach cancer at age 84.