Among the many people I have encountered while reconstructing my family history, few have led me into as many different archives, institutions and historical documents as my great-grandfather, Dr. med. Jürgen Christian Georg Berendsen (1855–1932) . He was born in Schleswig, became a physician, established a medical practice in Ratzeburg, married three times and raised a large family. His life extended from the years before German unification to the final months of the Weimar Republic. For many years, my knowledge of him consisted largely of entries in an old family book and fragments of family recollections. His name, occupation and dates were known, but the person behind those facts remained elusive. A surviving portrait provided a face. A medical dissertation provided a connection to the history of German surgery. Then archival correspondence began to reveal details of his education, professional career, marriages, children and homes. In 2026, this research developed into a ...