Historian Raphael Gross believes that the provenance research carried out to date by the E.G. Bührle Collection Foundation is insufficient. An independent investigation led by him concluded that more clarification is needed on the provenance of the works, many of which had Jewish owners during the Second World War. Do you want to read our weekly top stories? Subscribe here. Gross, who is president of the German Historical Museum, and his team have scrutinised the Bührle Foundation's provenance research to date. This was commissioned by the city and canton of Zurich as well as the Zürcher Kunstgesellschaft, the organisation responsible for the Kunsthaus Zürich, where numerous works from the collection are on display. On Friday, Gross presented the results. His conclusion was clear: the Bührle Foundation's efforts to date to clarify the provenance history of its works are insufficient. Further efforts are needed to fulfil the requirements set by the Kunstgesellschaft Zürich and the ...