Martin Dambach was a pediatrician in Berlin. Esther Stutzman was his part-time receptionist. Dambach was generally a kind person, but was nonetheless a citizen of the Greater German Reich. When he diagnosed Paul Klein with Tay-Sachs disease, a disease more common in Jews than in Aryans, he examined the Klein family much more closely. The Kleins were Jews, hiding as German citizens in Berlin. Despite Esther Stutzman's efforts to hide the Kleins, Dambach discovered inconsistencies in the Kleins' genealogical records, and reported it to the authorities.