Biography
Jessie Royce Landis (born Jessie Medbury; November 25, 1896 – February 2, 1972) was an American actress. Her name is also seen as Jesse Royce-Landis. She remains perhaps best-known for her mother roles in the Hitchcock films To Catch a Thief (1955) and North by Northwest (1959). Description above from the Wikipedia article Jessie Royce Landis, licensed under CC-BY-SA, full list of contributors on Wikipedia.
Known For

North by Northwest
Clara Thornhill

To Catch a Thief
Jessie Stevens

Airport
Harriet DuBarry Mossman

The Swan
Princess Beatrix

Gidget Goes to Rome
Albertina Blythe

Goodbye Again
Mrs. Van der Besh

Boys' Night Out
Ethel Williams

The Girl He Left Behind
Mrs. Madeline Shaeffer

Mr. Belvedere Goes to Col...
Mrs. Chase

It Happens Every Spring
Mrs. Greenleaf