Final answer:
No accurate information specific to Helen Lansdowne Resor was provided in the references, so a factual account of her as an influential figure in advertising cannot be detailed.
Step-by-step explanation:
Helen Lansdowne Resor was not explicitly mentioned in any of the provided information. However, it appears that the provided information included a mix-up of different historical figures that do not pertain to Helen Lansdowne Resor. Therefore, we cannot confidently provide a detailed answer to the question 'Who is Helen Lansdowne Resor?' based on the references given. To answer the question accurately, one must note that Helen Lansdowne Resor was a pioneering woman in the field of advertising, who achieved great success as a copywriter and executive at the J. Walter Thompson advertising agency.