Mrs. RIchard W. Knott Dupont, Aimé  (American, 1841-1900)

Aimé Dupont was a Belgian-born American sculptor and photographer who was best known for his pictures of opera singers when he was the official photographer for the Metropolitan Opera in New York City.

References

See: https://curiosity.lib.harvard.edu/women-working-1800-1930/catalog/45-990022242340203941