he experimented with a broad range of styles and mediums, was a protÉge of diego rivera, a follower offrench postimpressionists, and like marc chagall, proudly referenced his jewish heritage in many of his paintings. but until now, there has never been a major retrospective of his work. >> zakheim was especially shaken by the holocaust because he immigrated to the united states from poland. but almost all of the rest of his family stayed behind. he even went in the 1930s to warn them, but they did not heed that warning. he lost hundreds of relatives in the holocaust. he began to depict the disaster in his paintings as early as 1944, even before the war was over. >> in his later years, zakheim moved to a farm in sebastopol, infusing his paintings with themes of growth and rebirth, including this self-portrait. >> he's holding an apple in his right hand, but he's not going to take a bite. he's holding it as though it were the holy grail. creating a sense, yes, this is life and life itself is sacred. >> nathan zakheim is bernard's son. he and his son, kuva, are both art preservationists b