Ailsa Mellon Bruce (1901-1969), daughter of Andrew Mellon, acted as her father's hostess in Washington and when he was ambassador to Great Britain. In 1926 she married David K. E. Bruce, who became a distinguished diplomat and also served as the National Gallery [in D.C. as it's] president from 1939 to 1945. Mrs. Mellon Bruce established the Avalon Foundation in 1940, which, among other things, funded the Gallery's Andrew W. Mellon Lectures in the Fine Arts.  
(National Gallery of Art, D.C.) 
 

 
Andrew W. Mellon  
1931 
(Father to Ailsa Mellon Bruce) 
 
 

Notes 

• See the National Gallery of Art, D.C.
• See more on Philip Alexius de Laszlo