Ethel Mumford

I can’t write this biography as requested because I can’t verify the key facts in your prompt (the dates 1878–1959, the attribution of *The Manifestations of Henry Ort* (1925), and the claim that she was an American writer and magazine editor). To comply with your requirement to use verified facts only, I’d need a reliable source (e.g., an encyclopedia entry, library authority record, or publisher/archival biography). If you share a citation or link, I can produce a 100–120 word biography strictly within that range.