Moriz studied chemistry at the K.K. Polytechnisches Institut (the predecessor of the Technical University of Vienna). When his father died in 1882, Moriz upgraded and greatly extended the brewery he had inherited. In 1902 he transformed it into a joint stock company, with his cousins Wilhelm Kuffner and Karl Kuffner de Diószegh as partners. He was also president of the sugar refinery in Diószeg in Western Slovakia and of the Steinbruck brewery in Budapest; was among the largest owners of real estate in Vienna; owned significant collections of art including many works by Albrecht Dürer; and was a founding member of the Musikverein. From 1900 to 1919 he was an executive director of the Israelitische Kultusgemeinde Wien. In addition, Moriz was an enthusiastic and highly reputed alpinist who scaled most of the alpine summits of 4,000 m height and above, establishing new routes on the Eiger, Mont Blanc, Mont Pelvoux, Mont Maudit (on which the well-known Kuffner or Frontier ridge is named after him) and others.