A descendant of Conrad Hinrich Donner of Donners Park, Altona, Martha's father had been Superintendant of the American Sugar Refining Company and manager of the Sugar Trust in New York.
A descendant of Conrad Hinrich Donner of Donners Park, Altona, Martha's father came to New York and co-founded the de Castro & Donner Sugar Refinery. He was Superintendant of the American Sugar Refining Company and manager of the Sugar Trust at New York.