Jessie Royce Landis
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as Clara Thornhill North by Northwest 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.
Filmography
North by Northwest
as Clara Thornhill
To Catch a Thief
as Jessie Stevens
Airport
as Harriet DuBarry Mossman
Goodbye Again
as Mrs. Van der Besh
The Swan
as Princess Beatrix
Boys' Night Out
as Ethel Williams
My Man Godfrey
as Angelica Bullock
It Happens Every Spring
as Mrs. Greenleaf
Bon Voyage!
as Countessa 'La Comtesse' DuFresne
My Foolish Heart
as Martha Winters
Critic's Choice
as Charlotte Orr aka Charlie
Gidget Goes to Rome
as Albertina Blythe
Mr. Belvedere Goes to College
as Mrs. Chase
I Married a Woman
as Mrs. Blake
Meet Me Tonight
as Olive Lloyd Ransome (segment "Ways and Means")
The Girl He Left Behind
as Mrs. Madeline Shaeffer
Mother Didn't Tell Me
as Mrs. Wright
Main Street to Broadway
as Self (uncredited)
Mr. and Mrs. Bo Jo Jones
as Grandmother Greher
Grace Kelly: The American Princess
as Self (archive footage)