Historian; 2005–23 provenance researcher at the MAK, Vienna, and collaboration in several online projects on behalf of the Commission for Provenance Research; 2011–13 and 2016–17 collaboration in "German Sales" project by the Getty Research Institute, Los Angeles; 2017–19 collaboration in projects at the Zentralinstitut für Kunstgeschichte, Munich; 2014–18 board member, 2017–18 chairman of Arbeitskreis Provenienzforschung e.V.; numerous publications and productions in various media; courses at the University of Vienna; research focuses: Austrian cultural history in the nineteenth and twentieth century, digital media in the study of history; further information: leonhard.weidinger.wien.
The engineer Samuel Bauer, the proprietor of an engineering office, was married to Gittel Breine, née Goldstein (née 1880 in Brody, Galicia). The couple lived from 1927 at Julienstraße 58 in Vienna's 18th district.