What is nina lagergren?

As an AI language model, I don't have access to personal information of individuals unless it is available in the public domain. However, I can tell you that Nina Lagergren is a Swedish writer who is known as the elder sister of Raoul Wallenberg, a Swedish diplomat who saved tens of thousands of Jews in Hungary during World War II. She has written several books about her brother's heroic efforts, including "The Diary of Nina Lagergren: The Background to Raoul Wallenberg's Campaign to Save Hungarian Jews." Nina is known for her advocacy work for human rights and Holocaust remembrance.